16.2 Chemical Substances & Environmental Regulation: EPA TSCA, FIFRA, Clean Air & Clean Water Acts

Why the statute name is the first DABT move

Handbook IV.12 A names OSHA, CPSC, and ASTM. IV.12 B names TSCA, REACH, and FIFRA as examples of public-exposure chemical law (REACH is developed in section 16.3). Independent OpenExamPrep teaching here stays with the U.S. instruments you must not confuse: Toxic Substances Control Act (TSCA) as amended by the Frank R. Lautenberg Chemical Safety for the 21st Century Act (2016), Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), Clean Air Act (CAA) National Ambient Air Quality Standards and hazardous air pollutants, Clean Water Act (CWA) NPDES and water-quality standards, OSHA Hazard Communication and PELs (PELs were derived in Chapter 15), CPSC Federal Hazardous Substances Act, and ASTM consensus standards. This section is not an EPA, OSHA, CPSC, ASTM, or ABT product and does not claim official approval, review, or partnership.

A methylene chloride risk evaluation, a herbicide label, an ozone NAAQS review, a refinery outfall permit, a workplace SDS, and a drain-cleaner bottle are six different legal machines. Copying a PEL into a TSCA evaluation, or a FIFRA residue tolerance into a consumer FHSA label, is the item.

TSCA after Lautenberg (2016): existing versus new chemicals

TSCA (15 U.S.C. § 2601 et seq.) covers chemical substances in U.S. commerce that are not primarily regulated as pesticides (FIFRA), foods, food additives, drugs, cosmetics, or devices (FFDCA), or certain other excluded uses. The TSCA Inventory is the list of existing substances. New substances (not on the Inventory) generally need a premanufacture notice (PMN) under section 5 before manufacture or import for a non-exempt commercial purpose.

Existing chemicals — three phases. Lautenberg replaced the old, weakly scheduled program (and the cost-benefit reading that helped sink EPA’s 1989 asbestos ban in Corrosion Proof Fittings) with a mandatory pipeline:

1. Prioritization. EPA designates substances as high-priority (risk evaluation required) or low-priority (no evaluation at that time). The statute requires EPA to have 20 high-priority and 20 low-priority designations in process on an ongoing basis. At least half of the initial high-priority set had to come from the 2014 TSCA Work Plan. The first ten evaluations included asbestos, methylene chloride, N-methylpyrrolidone, TCE, PCE, carbon tetrachloride, 1,4-dioxane, HBCD, Pigment Violet 29, and 1-bromopropane.
2. Risk evaluation (section 6(b)). EPA determines whether the substance presents an unreasonable risk of injury to health or the environment under the conditions of use. Congress directed that this determination be made without consideration of costs or other nonrisk factors. EPA must consider potentially exposed or susceptible subpopulations (PESS) — workers, children, pregnant people, and heavily exposed communities are the usual examples.
3. Risk management (section 6(a)). If unreasonable risk is found, EPA must issue a rule to the extent necessary so the substance no longer presents that unreasonable risk. Costs and alternatives enter here, not in the risk-evaluation finding. Restrictions can include bans, concentration limits, PPE mandates, or use prohibitions.

New chemicals — PMN. A PMN generally gives EPA 90 days (the clock can pause). Lautenberg requires an affirmative determination, not silence-as-consent. Typical outcomes: presents unreasonable risk, not likely to present unreasonable risk under the reviewed conditions of use, or insufficient information. EPA may issue a section 5(e) order, a significant new use rule (SNUR), or both. Low-volume, polymer, and bona fide R&D exemptions exist; they are not a general “small company skip.” Section 4 still authorizes test rules or orders; section 8 (including Chemical Data Reporting) collects volume and use information. Confidential chemical identity now requires substantiation; many names have moved to the public Inventory.

FIFRA: pesticides are not TSCA chemicals in disguise

FIFRA requires EPA registration before a pesticide may be sold. The statutory finding is that the product will not cause unreasonable adverse effects on the environment when used according to the label. After FQPA, that phrase includes human dietary risk from food-use residues judged by reasonable certainty of no harm, with the extra 10× children’s factor when appropriate, plus aggregate and cumulative assessment. 40 CFR Part 158 is the data-requirement map: acute “six-pack,” repeated-dose, chronic/onco, reproductive/developmental, mutagenicity, metabolism, residue chemistry, and ecological studies (avian, aquatic, nontarget plants and insects) scaled to use pattern.

The label is the law. A registered use that differs from the label is a FIFRA violation even if the off-label rate looks “more conservative.” Restricted-use products require certified applicators. Registration review is a cyclic reassessment (a 15-year cycle is the statutory planning figure). Experimental Use Permits cover limited unregistered testing. Do not run an industrial solvent through FIFRA because it is toxic, and do not run a herbicide through TSCA section 6 because it is a chemical.

Clean Air Act: NAAQS versus HAPs

Chapter 15 taught NAAQS as environmental quality standards. The regulatory-framework point is the split:

• Criteria pollutants (CAA sections 108–109): ozone, particulate matter (PM2.5 and PM10 as indicators), carbon monoxide, sulfur dioxide, nitrogen dioxide, and lead. Primary NAAQS protect public health including susceptible groups with an adequate margin of safety; secondary NAAQS protect public welfare. Implementation is through state implementation plans, not through an 8-hour OSHA PEL and not through a TSCA section 6 ban of “air.”
• Hazardous air pollutants (HAPs) (section 112): a listed set (the 1990 Amendments’ list, with later additions and deletions) controlled primarily by National Emission Standards for Hazardous Air Pollutants using maximum achievable control technology (MACT), then a residual-risk review. HAPs are not the six criteria pollutants. New Source Performance Standards (section 111) are technology-based limits for new or modified stationary sources of criteria and other pollutants.

Do not memorize a 2026 screenshot of NAAQS ppm values as a frozen DABT table (Chapter 15). Do memorize which list and whether feasibility already entered the emission standard.

Clean Water Act: NPDES and water quality

The CWA makes point-source discharges of pollutants to waters of the United States unlawful without a permit. National Pollutant Discharge Elimination System (NPDES) permits (section 402), issued by EPA or authorized states, set effluent limits that are the more stringent of:

• Technology-based limits from effluent guidelines (or best professional judgment), and
• Water-quality-based effluent limits (WQBELs) needed to meet state water-quality standards (section 303), including designated uses, numeric or narrative criteria, and antidegradation.

Total maximum daily loads (TMDLs) apply to impaired waters (303(d)). Indirect dischargers to publicly owned treatment works face pretreatment standards. Whole-effluent toxicity testing and chemical-specific limits can both appear. NPDES is not an MCL (Safe Drinking Water Act, Chapter 15) and not a PEL.

OSHA HazCom / GHS, and PELs as a cross-reference

29 CFR 1910.1200, the Hazard Communication Standard (HCS), is OSHA’s right-to-know rule. OSHA first built HCS around UN GHS Revision 3 (2012). A May 2024 final rule updates HCS primarily to GHS Revision 7 (with selected Revision 8 non-animal skin methods). OSHA later extended the staggered dates in a 15 January 2026 final rule: manufacturers/importers of substances by 19 May 2026, employers for substances by 20 November 2026, and mixtures into 2027–2028 (manufacturers 19 November 2027, employers 19 May 2028). Items test HCS versus PEL versus FHSA, not a memorized calendar snapshot. HCS requires a written program, a chemical inventory, 16-section Safety Data Sheets, GHS labels (product identifier, supplier, pictogram, signal word Danger or Warning, hazard statements, precautionary statements), and training. Sections 12–15 of the SDS (ecology, disposal, transport, other regulatory) must appear for format but are not OSHA-enforced because they belong to other agencies.

HCS classifies hazards; it does not set a PEL. Enforceable workplace concentrations remain PELs in 29 CFR 1910.1000 and substance-specific standards — legal status, Table Z history, TLV/REL contrast, and OEL derivation are Chapter 15. A perfect SDS does not excuse a PEL exceedance. GHS acute-toxicity categories are not CPSC FHSA bins (next paragraph).

CPSC FHSA: household products, not workplaces

The Federal Hazardous Substances Act (FHSA), administered by the U.S. Consumer Product Safety Commission (CPSC), requires cautionary labeling on household hazardous substances and allows bans when labeling cannot adequately protect the public. 16 CFR 1500.3 defines highly toxic in part as a rat oral LD50 of 50 mg/kg or less, a rabbit 24-hour dermal LD50 of 200 mg/kg or less, or a 1-hour inhalation LC50 of 200 ppm or less (gas/vapor) or 2 mg/L or less (mist/dust) under the specified test conditions. Toxic covers a broader acute band (oral single doses from 50 mg/kg to 5 g/kg in the FHSA scheme, with possible labeling exemptions in the 500 mg/kg to 5 g/kg region when physical form or packaging makes harm unlikely). Highly toxic household products take the signal word DANGER, the word POISON, and the skull and crossbones. Human experience can override animal LD50 when people are actually being injured. Child-resistant packaging is a related but distinct Poison Prevention Packaging Act duty. FHSA is not OSHA HCS and not a chronic RfD exercise.

ASTM: consensus standards (IV.12 A)

ASTM International (formerly the American Society for Testing and Materials) is a voluntary consensus standards body. ASTM methods and specifications (toy safety, biobased-content radiocarbon methods such as ASTM D6866, material tests) become mandatory only when a statute or regulation incorporates them by reference, or when a contract or certification program requires them. Handbook IV.12 A groups ASTM with OSHA and CPSC because Diplomates use these documents as test methods and product specs, not as a fourth environmental statute. An ASTM method number on a protocol does not replace a missing TSCA PMN or a missing FIFRA acute-tox study.

Scenario

A company makes (1) a new industrial degreasing solvent not on the TSCA Inventory, (2) a glyphosate-like herbicide, (3) a plant that emits both PM2.5 and a listed HAP, (4) process wastewater to a river, (5) the same solvent in 55-gallon workplace drums, and (6) a consumer-strength gel in a squeeze bottle. Six filings: PMN, FIFRA registration, Title V / NESHAP / SIP air permits, NPDES, HCS SDS plus PEL comparison, FHSA household label. One SDS pasted onto all six is a failing answer.

Traps

• Applying 1976 TSCA folklore (EPA must prove cost-benefit before touching existing chemicals; PMN file-and-wait) after 2016.
• Using TSCA for a pesticide or FIFRA for an industrial chemical.
• Treating NAAQS and HAPs as one list, or a PEL as a NAAQS.
• Using NPDES numbers as drinking-water MCLs.
• Equating GHS category 2 with FHSA highly toxic or with a PEL.
• Citing ASTM as if it repealed OSHA.