The Operative Sentence

Three layers of law decide whether blood may go to the sanitary sewer, and OSHA defers to all of them

OSHA says in writing that it does not regulate final disposal; EPA lost its medical waste authority in 1991; the answer is state and municipal.

DECIDED BY: your state medical waste rule → your POTW’s sewer-use ordinance → your facility policy. Not OSHA.

In brief

• OSHA’s bloodborne pathogens standard contains exactly one sentence about disposal, and that sentence hands the question to federal, state and local law. The agency has also written the point in plain words: OSHA does not regulate the final disposal of regulated medical waste.12
• EPA has had no medical waste authority since the Medical Waste Tracking Act expired in 1991, and says so on its own page. Its one sewering prohibition is about pharmaceuticals, not blood.35
• CDC does recommend the sanitary sewer, at Category II — the weakest of its four actionable tiers — and conditions the recommendation on the state having declared the method acceptable. In a state that has declared nothing, there is nothing to rely on. We think that conditional is the most consequential clause in the recommendation and the least quoted.7
• Of the seven state rules whose operative text we retrieved, six name the sanitary sewer as an available route, on six different conditions. North Carolina’s runs opposite to intuition: the sewer route is affirmatively enumerated for volumes over 20 mL.8
• The municipal layer binds independently, and in the ordinance texts we hold the rationale is usually the pipe rather than the pathogen. Federal pretreatment law reaches blood only through obstruction and oxygen demand; the words blood, medical, infectious and pathological do not appear in 40 CFR § 403.5 at all.6

Layer one: the federal sentence, and what it does

The question arrives in the same shape every time. Somebody has been told that a suction canister may not be emptied into a hopper, or must be, and the authority given is OSHA. There is a provision to look at, and it is short. Paragraph (d)(4)(iii) of the bloodborne pathogens standard governs regulated waste; subparagraph (A) covers contaminated sharps containers, (B) covers other regulated waste containment, and (C) is the whole of what the standard says about disposal.1

(B) Other Regulated Waste Containment—(1) Regulated waste shall be placed in containers which are: (i) Closable; (ii) Constructed to contain all contents and prevent leakage of fluids during handling, storage, transport or shipping; (iii) Labeled or color-coded in accordance with paragraph (g)(1)(i) this standard; and (iv) Closed prior to removal to prevent spillage or protrusion of contents during handling, storage, transport, or shipping.

(C) Disposal of all regulated waste shall be in accordance with applicable regulations of the United States, States and Territories, and political subdivisions of States and Territories.

Read the full sectionArchived copy

Both subparagraphs are printed here because they are usually read as one duty and they are not. (B) is a containment rule whose four criteria are all about movement — handling, storage, transport, shipping — and whether that duty attaches at the moment fluid is poured out of a canister is a genuine open question that OSHA has never squarely answered. Our article on the standard sets that ambiguity out at length and does not resolve it. (C) is the disposal clause, and it is a deferral.

The agency has also said the same thing outside the regulatory text. In April 2011 OSHA answered a nurse practitioner who had asked whether urine specimen containers must be red-bagged. The answer to the question asked was no, unless the sample was contaminated with blood or other potentially infectious materials. The letter then adds a sentence that has nothing to do with urine specimens and everything to do with this subject.2

Therefore, urine collection containers would not be considered regulated waste under OSHA’s Bloodborne Pathogens Standard unless the sample it contained was contaminated with blood or OPIM. Please be aware that OSHA does not regulate the final disposal of regulated medical waste. You should contact the Environmental Protection Agency and the appropriate District of Columbia agency for more information on this matter.

Read the full letter

The preceding sentence is quoted with it because the scope matters. This is a letter about specimen containers, and OSHA’s letters say in their own boilerplate that they interpret only the requirements discussed and may not apply outside the original correspondence.2 The disposal sentence is nonetheless a statement about the agency’s jurisdiction rather than a ruling on urine, it is consistent with (d)(4)(iii)(C), and it points the reader at EPA.

Layer one and a half: EPA points back at the states

That referral runs into a vacuum. The Medical Waste Tracking Act of 1988 created a two-year federal demonstration programme covering New York, New Jersey, Connecticut, Rhode Island and Puerto Rico; the regulations took effect on 24 June 1989 and expired on 21 June 1991.3 Nothing replaced them. EPA’s own medical waste page states the position without hedging.

Medical waste is primarily regulated by state environmental and health departments. EPA has not had authority, specifically for medical waste, since the Medical Waste Tracking Act (MWTA) of 1988 expired in 1991. It is important to contact your state environmental program first when disposing of medical waste.

Read the full page

Two federal provisions are worth knowing anyway, because both are routinely misremembered. The first is the domestic sewage exclusion, which removes from the definition of solid waste — and therefore from the reach of the hazardous waste programme — “any mixture of domestic sewage and other wastes that passes through a sewer system to a publicly-owned treatment works for treatment, except as prohibited by § 266.505 and Clean Water Act requirements at 40 CFR 403.5(b).”4 The second is § 266.505 itself, which is the exception the first provision names, and which is about drugs.

All healthcare facilities—including very small quantity generators operating under § 262.14 of this subchapter in lieu of this subpart—and reverse distributors are prohibited from discharging hazardous waste pharmaceuticals to a sewer system that passes through to a publicly-owned treatment works. Healthcare facilities and reverse distributors remain subject to the prohibitions in 40 CFR 403.5(b).

Read the full section

The two are read together often enough that the pharmaceutical ban gets attached to blood. It does not reach blood, and the fact that EPA needed a bespoke rule to stop drugs going down a healthcare drain is itself evidence about the default: absent a specific prohibition, what goes through a sewer to a treatment works leaves the federal hazardous waste programme at the drain.45

CDC recommends it, at its weakest tier, on a condition most readers skip

The affirmative federal-level statement that the sanitary sewer is an acceptable destination is not a regulation at all. It is a recommendation in the CDC and HICPAC Guidelines for Environmental Infection Control in Health-Care Facilities, issued in 2003 and carrying a July 2019 update stamp. It is recommendation I.IV.E, and it is one sentence.7

The rating is published in the guideline’s own methods section, alongside Categories IA, IB and IC.7 A reader who has only ever seen the sentence quoted in a vendor page or a policy binder will not know it carries the lowest of the four labels, because the label is almost never quoted with it.

We think the more important omission is the second condition. The word is declared. A state that has never legislated or promulgated anything on the subject has not declared it, and the recommendation by its own terms does not reach that case. That distinction between a state that permits and a state that is silent is doing real work in the sentence, and we could not find a published source that draws it. It also explains why the state layer below is not a formality: in about forty of the fifty states, so far as we can tell, nobody has checked whether there is anything to declare.

The guideline’s background text, which sits behind the recommendation and is not itself rated, is worth reading alongside it. It states that the contents of vessels holding more than a few millilitres of blood “can either be inactivated in accordance with state-approved treatment technologies or carefully poured down a utility sink drain or toilet”; that “[n]o evidence indicates that bloodborne diseases have been transmitted from contact with raw or treated sewage”; and, in the same paragraph, the constraint that actually worries the receiving utility: “large quantities of these fluids, with their high protein content, might interfere with the biological oxygen demand (BOD) of the system.”7 The infection argument and the loading argument point in different directions, and the loading argument is the one the sewer ordinances in layer three are built on.

Layer two: the state rule, where the real variation lives

We retrieved and read the operative text of seven state rules. That is seven of fifty, and the other forty-three are not covered by this article in either direction. Where we could not obtain a state’s primary text, our register says so as a published row rather than leaving a gap.

North Carolina runs backwards

The intuition almost everyone brings is that small volumes are permissible and large volumes are not. North Carolina’s rule is the other way around, and the sewer is the route the rule names first.8

(1) Blood and body fluids in individual containers in volumes greater than 20 milliliters shall be disposed of by sanitary sewer if the local sewage treatment authority has been notified; or treated by incineration or steam sterilization.

(6) Noninfectious medical waste and blood and body fluids in individual containers in volumes of 20 milliliters or less may be disposed of in a municipal solid waste landfill, or treated by the treatment methods as described in this Paragraph. Blood and body fluids in individual containers in volumes of 20 milliliters or less may also be disposed of in a sanitary sewer.

Read the full rule

Above 20 mL the sewer is an affirmatively enumerated route and the gate on it is notification, not a permit and not an approval. Below 20 mL the sewer is one of several options. The rule also defines its own subject narrowly: “Blood and body fluids” means liquid blood, serum, plasma, other blood products, emulsified human tissue, spinal fluids, and pleural and peritoneal fluids, and expressly excludes dialysates, faeces and urine unless removed during surgery or autopsy.8

Ohio permits by default, and one new word narrowed it

Ohio is the sharpest contrast with North Carolina in the states we read: the permission is the default and a permit is what takes it away. The rule was renumbered effective 6 April 2025, from OAC 3745-27-30 to OAC 3745-570-100. The old citation is dead and still widely published; the live page for it returns no rule.9

(E) A generator may discharge untreated liquid or semiliquid infectious waste consisting of exclusively blood, blood products, body fluids, and excreta into a disposal system as defined in section 6111.01 of the Revised Code unless otherwise specified in a permit for the system issued under Chapter 6111. of the Revised Code.

Read the full rule

The renumbering was not cosmetic. The predecessor rule described “infectious wastes consisting of blood, blood products, body fluids, and excreta”; the current rule inserts exclusively before that list.9 What that word does to a container holding blood together with irrigation saline is a live question, and the rule does not answer it. We raise it and leave it there. The proviso also changed, from a discharge that is “inconsistent with the terms and conditions of” a permit to one “otherwise specified in” a permit, which is a lower trigger.

California’s carve-out, and the word it does not use

California’s provision is structurally the strongest permission of the seven, because it is an express exception to a treat-before-disposal command rather than an item on a list of allowed routes. Subdivision (a) requires that medical waste be incinerated, steam sterilised or treated by an approved alternative “[e]xcept as provided in subdivisions (b) and (c).”10 Subdivision (b) is the exception.

(b) Fluid blood or fluid blood products may be discharged to a public sewage system without treatment if its discharge is consistent with waste discharge requirements placed on the public sewage system by the California regional water quality control board with jurisdiction.

Read the full section

Two things about the words. The subject is fluid blood or fluid blood products, and not body fluids generally, which is narrower than Ohio and Texas, both of which name body fluids expressly. And the statute says “public sewage system”, not “sewer” — the word sewer does not appear in § 118215 at all, so a keyword search for it in the California code returns nothing and invites the conclusion that the state is silent when it is not.10

There is a drafting asymmetry inside the same section that we have not seen written down. Subdivision (c)(3), which governs chemically disinfected biohazardous laboratory waste, conditions discharge on the regional board’s requirements and on “the requirements imposed by the owner or operator of the public sewage system.” Subdivision (b) contains the first condition and not the second.10 That is what the text says. It is not a basis for concluding that a California generator may disregard its sewer utility, because the utility’s ordinance binds on its own authority and not by permission of the Health and Safety Code — which is the whole point of layer three.

Texas, Rhode Island, Massachusetts, Florida

Texas lists ten approved methods for bulk human blood, blood products and body fluids at 25 TAC § 1.136(a)(2), and only the first stands alone: “(A) discharging into a sanitary sewer system;”. Every other lettered method names a treatment step first — steam disinfection, incineration, chemical disinfection, thermal inactivation and so on — followed by landfill or by grinding and flushing.11 Two definitions do the qualifying work: “Bulk” is “a containerized, aggregate volume of 100 milliliters (mL) or more”, and “Discharge to sanitary sewer system” means “a discharge or flushing of waste into a sanitary sewer system which is done in accordance with provisions of local sewage discharge ordinances.”12 The Texas definition writes layer three into layer two by reference.

Rhode Island is the only one of the seven with a volumetric cap, and it applies to on-site systems rather than to sewers. The rule permits discharge to a sanitary sewer with the local sewer authority’s approval where the system has a secondary wastewater treatment facility, by direct discharge or after steam sterilisation or after chemical disinfection. For an individual sewage disposal system it inverts the disinfection logic: discharge is permitted “provided that chemical disinfectants and/or preservatives are not added to the body fluids, human blood and/or blood products prior to discharge and that no more than ten (10) gallons … are discharged in an ISDS during a twenty-four (24) hour period”.14 Chlorine that is acceptable ahead of a treatment plant is a problem for a septic field, and the rule says so by forbidding it.

Massachusetts is the plainest text of the seven: “If the waste generator is connected to a municipal sewerage system or septic system, free draining blood and blood products, except blood saturated materials, may be disposed of directly into these systems unless such disposal is otherwise restricted by the authorized approving agency.”15 The exclusion of blood saturated materials is the same distinction the federal definition of regulated waste draws between a liquid and an item that would release liquid if compressed.1

Florida is the one row we publish as Qualified, and the reason is internal. Subsection (1) of the treatment rule opens with what reads as a blanket mandate: “Biomedical waste shall be treated by steam, incineration, or an alternative process approved by the department … prior to disposal.” Subsection (5) then says: “Biomedical waste may be disposed into a sanitary sewer system, an onsite sewage treatment and disposal system, or other system approved to receive such waste by The Department of Environmental Protection or the department, if it is in a liquid or semi-solid form and aerosol formation is minimal.”16 Subsection (5) does not cross-reference subsection (1), and nothing in (1) carves (5) out. The rule has been effective in this form since 3 June 1997, and chapter 64E-16 entered rule development on 1 April 2026.16 The phrase is “semi-solid”, not “semi-liquid”, and the aerosol clause is part of the condition; secondary databases have been observed rendering both incorrectly, which is a reason to read the rule at the Florida Department of State’s own server.

Virginia: the exclusion that works from the other end

Virginia does not enumerate the sewer as a disposal method. It removes sewered material from the regulated medical waste programme altogether, which arrives at a similar place by a different route, and it is the only rule among the seven-plus-one we read that names suction canisters in its own text.17

C. The following materials are not solid wastes or regulated medical wastes: 1. Domestic sewage, including wastes that are not stored and are disposed of in a sanitary sewer system (with or without grinding).

D. The following solid wastes are not regulated medical wastes for purpose of this chapter: … 8. The following discarded items when they are empty: urine collection bags and tubing, suction canisters and tubing, IV solution bags and tubing, colostomy bags, ileostomy bags, urostomy bags, plastic fluid containers, enteral feeding containers and tubing, hemovacs, urine bottles, and urine specimen cups, unless the items are subject to regulation under 16VAC25-90-1910.1030 (29 CFR 1910.1030) or a comparable state or federal standard.

Read the full section

The emptied container is a separate question, and most rules do not answer it

Pouring the fluid out and disposing of the container are two decisions, and the cost of the second is the term most often left out of a comparison between fluid-handling methods. Of the eight state rules quoted on this page, we found no provision addressing the status of an emptied suction canister except Virginia’s, and Virginia’s exemption is conditional in its own text: the item must be empty, and it must not be subject to the bloodborne pathogens standard or a comparable state or federal standard.17 Where a state rule is silent on the container, the container’s status falls back to whatever the general definitions in that state and in 29 CFR 1910.1030(b) make of it, and those definitions turn on whether the item would release blood in a liquid or semi-liquid state if compressed, or is caked with dried blood and capable of releasing it during handling.1 That is a question about a specific emptied container in a specific state, and this page cannot answer it for any facility.

Layer three: the ordinance, which binds on its own authority

The receiving utility’s sewer-use ordinance is not downstream of the state rule in any legal sense. It is a separate instrument, written by a different body for a different purpose, and a generator can satisfy a state medical waste rule and still violate it. Four of the seven state texts above make the point themselves by conditioning on local requirements, approval or ordinances.8121415

The federal floor under every such ordinance is 40 CFR § 403.5, the national pretreatment prohibitions. It is short, and it is worth knowing what is not in it.

Blood reaches federal pretreatment law only derivatively, through prohibition (b)(3) — “[s]olid or viscous pollutants in amounts which will cause obstruction to the flow in the POTW resulting in Interference” — and (b)(4), “[a]ny pollutant, including oxygen demanding pollutants (BOD, etc.) released in a Discharge at a flow rate and/or pollutant concentration which will cause Interference with the POTW.”6 Both require actual interference. Federal pretreatment law treats blood as a loading problem, which is the same thing CDC’s background text says when it raises biological oxygen demand.7

Of the eleven large utilities in Register B, we hold transcribed operative text for three, ran published keyword scans on three more, and have read nothing quotable in the remaining five. The register publishes that split per row rather than smoothing it.

Two of the three transcribed rows are worth setting against each other. Los Angeles prohibits “[a]ny human or animal blood suspected or known to contain bloodborne pathogen(s)” in the same numbered list that prohibits recognisable portions of the human anatomy, pharmaceutical wastes, medical wastes and sharps.21 That is a pathogen rationale, stated as one. Boston’s is a circle: MWRA’s regulation prohibits substances containing pathogenic organisms including infectious medical waste “whose disposal via the municipal Sewerage System or via a septic system is prohibited by 105 CMR 480.200”, and 105 CMR 480.200(A)(1) affirmatively permits free draining blood.2215 The prohibition bans what the health rule bans, and the health rule does not ban it. We think a reader who has been handed the MWRA citation alone, without the state rule it points to, has been handed half a sentence.

The “whole blood” clause, and a chain we could not close

Search a city sewer code for blood and the phrase that comes back is usually “whole blood”. It reads like a medical waste provision. In the ordinances where we have read the surrounding words, it is not one. Here is the clause in the sewer use ordinance of one North Carolina district, reproduced at length because the neighbours are the interpretation.

Any solid or viscous substances in quantity or character capable of causing obstruction to flow in sanitary sewers, interference with proper operation of the WRF, or substances that will solidify or become viscous at temperatures between 0°C (32°F) and 60°C (140°). Prohibited materials covered by this section include, but are not limited to, eggshells, ashes, cinders, ceramic waste, stone or marble dust, sand, mud, straw, metal shavings or sludge, grass clippings, glass, glass grinding or polishing wastes, fabric (woven and non-woven), rags, feathers, bones, tar, plastics, wood, paunch manure, insulation materials, stock or poultry feeds, processed grains, spent hops, animal tissues, hair, hides or fleshing, entrails, whole blood, viscera or other fleshy particles from processing or packing plants, lime or similar sludges, residues from refining or processing of fuel or lubricating oils.

Read the full ordinance

“Whole blood” sits between entrails and viscera or other fleshy particles from processing or packing plants, inside a prohibition whose operative test is obstruction of flow and interference with the plant. The list is a rendering-and-packing-house list, and the clause says whose particles it means. Reading it as a rule about a suction canister is a category error, and it is the trap anyone surveying municipal codes by keyword will fall into.

Where the clause comes from is a separate question, and this is the point at which we have to correct our own working note. The attribution we started from, and which appears in secondary discussions of the subject, is that the list descends from EPA’s Model Pretreatment Ordinance. We retrieved both editions of that document and scanned them.

In both editions, the only appearances of the word blood are inside the definition of Medical Waste: “Isolation wastes, infectious agents, human blood and blood products, pathological wastes, sharps, body parts, contaminated bedding, surgical wastes, potentially contaminated laboratory wastes, and dialysis wastes.”1819 That definition is used by exactly one prohibition, and in both editions it is numbered (14) and sits in the optional block: “Medical Wastes, except as specifically authorized by [the Superintendent] in an individual wastewater discharge permit [or a general permit {optional}]; {optional}”.18 The 2007 edition marks the boundary explicitly — prohibitions (1) through (8) “are mandatory National Pretreatment Standards and must be included in the ordinance”, and (9) through (18) are optional.18

So the model does have a blood provision, and it is not the slaughterhouse list. It is an optional, permit-conditioned prohibition on medical wastes. The slaughterhouse list is real, it is common, and it is where “whole blood” lives in the codes we have read — the Buncombe County ordinance carries the EPA model’s medical waste definition almost word for word and the slaughterhouse list as well, which is consistent with a drafter assembling an ordinance from more than one exemplar.20 But we could not find the list in either EPA model ordinance we retrieved, and we could not establish where it does come from. Under this publication’s rules that is a finding about the record and not about the world: the clause may well have an EPA ancestor in a document we have not obtained. What we can say is that it is not in the two we read, and that we should not have written otherwise. The substantive point is unaffected and now rests on the ordinance text itself rather than on a lineage: the clause is about obstruction, the neighbours are abattoir solids, and it is not a hospital rule.

What this means for someone holding a policy they cannot source

This section is our judgment, and it is labelled as such. In our assessment, the reason this question stays unsettled in so many facilities is that the three instruments that decide it are held by three different offices, and the one everybody names is the one with nothing to say. A policy attributed to OSHA can be checked against a single sentence of the Code of Federal Regulations in under a minute, and if the sentence is (d)(4)(iii)(C) the accurate response is not that the policy is wrong. It is that the citation is, and that the real authority is a state rule and an ordinance, both of which have numbers.

We contend that the useful artefact for a unit is not a position on pouring but a written note of three citations: the state medical waste rule with its current numbering, the receiving utility’s ordinance section, and the facility’s own policy with its author. A facility may be stricter than either instrument above it, and a stricter policy is not thereby wrong. It is a different document with a different author, and knowing which of the three a practice comes from is what lets anyone argue about it usefully.

What would change this answer

• Your state. Forty-three states are not covered by this page. Register A publishes them as unread rows rather than as an absence of law, and a single retrieved state rule changes the answer for everyone in that state.
• Your utility’s ordinance section. Five of the eleven utilities in Table 3 have no transcribed clause. If yours prohibits medical waste as a category, or blood as a pathogen rather than as a solid, the state rule above it does not settle the question.
• A renumbering. Ohio’s rule moved in April 2025 and the superseded citation still appears in published material. Florida’s chapter entered rule development on 1 April 2026. Either could make a quotation on this page stale before the next review date.
• The Texas text as it stands today. We have confirmed that the subchapter is still listed as current law and that no amendment was published between July 2024 and August 2026. We have not read the rule on today’s date, because Texas no longer publishes it in a retrievable form. Anyone who can reach the state’s replacement portal in a browser can close that gap by reading the Source Note.
• The provenance of the “whole blood” list. A pre-1992 EPA model ordinance, a Water Pollution Control Federation manual of practice, or a state model ordinance containing the paunch-manure list would settle where the clause came from. We could not find one. If you have it, the address is below.

Where this could be wrong

The strongest objection to this page is that its central structural claim, three layers decided in that order, is a framing we built rather than a proposition any single document states. No regulation says “there are three layers.” What the documents say is that OSHA defers to federal, state and local law; that EPA has no medical waste authority; that CDC conditions its recommendation on state declaration and local requirements; that four of seven state rules condition on local approval or ordinances; and that pretreatment ordinances exist and bind. The three-layer reading follows from those, and we think it follows tightly, but a reader who wanted to describe the same material as two layers with a federal floor, or as four with the facility policy counted separately, would not be contradicting any text on this page.

Second, seven states are not fifty and are not a sample of fifty. We read the ones whose primary text we could obtain, which biases the set toward states that publish well online. That every state in Table 1 names the sewer somewhere is not a claim about the states we did not read, and a full survey would be likely to turn up prohibitions we have not seen.

Third, the Category II point cuts both ways. We have made something of the fact that CDC’s recommendation carries the guideline’s weakest actionable rating. That rating describes the strength of the evidence CDC had for the recommendation, not the strength of the evidence against the practice, and CDC’s own background text states that no evidence indicates bloodborne disease transmission from contact with raw or treated sewage.7 A reader who takes “Category II” away from this page as a warning about safety has taken the wrong thing; it is a statement about what kind of recommendation it is and what conditions it carries.

Fourth, we changed our mind in public in the section above, which means an earlier version of our own research material carried an attribution we have now failed to verify. Our register on sewer-use ordinances currently states the EPA-model lineage of the “whole blood” clause, and on the evidence in Table 4 that statement needs to come out. The correction will be dated and published rather than made quietly.