Certified Generalist OHS Professional (COHSP) — Study Guide

Certified Generalist OHS Professional (COHSP) — Study Guide

Credential: Certified Generalist OHS Professional (COHSP) Issuing body: Council on Certification of Health, Environmental and Safety Technologists (CCHEST) — verify current administering body, as credential sponsorship in the CCHEST family has evolved Jurisdiction: United States Level: Professional generalist (positioned as the broad-scope OHS credential in the CCHEST family) Prerequisites: Combination of education and professional OHS experience per the certifying body's eligibility rules — verify current requirements (degree and experience thresholds) in the candidate handbook before applying. Exam format: Multiple-choice examination covering generalist OHS knowledge — verify current question count, duration, and blueprint in the candidate handbook. Renewal: Multi-year recertification cycle with continuing education — verify current cycle and requirements.

Scope note: Public documentation for the COHSP is thinner than for the CSP/CIH/CHMM. The guide below covers the generalist OHS body of knowledge the credential assesses. Anything presented here about the COHSP's specific exam mechanics should be verified against the current candidate handbook — the technical content (OSHA, IH, safety management) is standard and transferable.

Why this credential matters

The COHSP serves the generalist OHS practitioner — the plant safety coordinator, the multi-site EHS generalist, the consultant who needs credible breadth across safety, health, and environmental. It sits in the same professional space as the CSP (generalist safety) but under the CCHEST umbrella that also credentials the technician tier (OHST). For practitioners whose careers run through the CCHEST family, it is the professional-grade generalist mark.

Knowledge domains

Domain 1 — Safety management systems and leadership

Plan-do-check-act (ANSI/ASSP Z10.0, ISO 45001): policy, planning, implementation, checking, review. Safety culture: leading vs. lagging indicators, near-miss programs, behavior-based safety (and its critiques), employee participation (safety committees, VPP concepts). The hierarchy of controls as the decision framework. Incident investigation: immediate vs. root causes, 5 whys, fishbone, corrective-action tracking. Emergency planning: EAP (1910.38), evacuation, fire brigades (1910.156).

Domain 2 — OSHA compliance (general industry and construction)

The OSH Act: General Duty Clause §5(a)(1), employer/employee rights, inspections (opening conference, walkaround, closing conference), citations and penalties (other-than-serious, serious, willful, repeat — and the failure-to-abate daily penalty), contesting (OSHRC), record-keeping (1904: OSHA 300 log, 300A summary, 301 reports; recordable vs. first-aid — the 1904.7 criteria; DART/TRIR computation).

Key standards at generalist depth: walking-working surfaces (1910 Subpart D — the 2016 update: fall protection, ladders, dockboards), means of egress (Subpart E), powered platforms, occupational health/environmental control (Subpart G — ventilation, noise), hazardous materials (Subpart H), PPE (Subpart I — hazard assessment, 1910.132; eye/face, head, foot, hand), general environmental controls (Subpart J), medical/first aid (Subpart K), fire protection (Subpart L), materials handling (Subpart N), machinery/machine guarding (Subpart O), hand tools (Subpart P), welding (Subpart Q), electrical (Subpart S), toxic/hazardous substances (Subpart Z — PELs, substance-specific standards, HazCom 1910.1200). Construction (1926) at survey level: focus four (falls, struck-by, caught-in/between, electrocution), Subpart M fall protection, Subpart P excavations, Subpart L scaffolds.

Domain 3 — Industrial hygiene fundamentals

Anticipation/recognition/evaluation/control. Exposure limits: PEL (legal), TLV (ACGIH consensus), REL (NIOSH) — which governs which decision. Air sampling basics: active (pumps, tubes, filters) vs. passive; TWA/STEL/ceiling; the mixture rule Σ(C/OEL) ≤ 1. Noise: 90 dBA PEL (5-dB), 85 dBA action level (hearing conservation), 85 dBA REL (3-dB). Ventilation: dilution Q=GK/C and its limits; LEV components (hood, duct, cleaner, fan, stack) and make-up air. Respiratory protection: 1910.134 program elements, APFs (half-face 10, full-face 50), MUC = APF × OEL. Heat stress (WBGT, work/rest), ergonomics (NIOSH lifting equation conceptually, MSD risk factors), radiation basics (ALARA).

Core calculations: TRIR/DART; TWA; noise dose (OSHA); mixture; MUC; GPA-style dilution ventilation.

Domain 4 — Fire protection and emergency response

Fire chemistry (tetrahedron), classes A/B/C/D/K, extinguisher selection and placement (NFPA 10: travel distances — 75 ft Class A, 30–50 ft Class B depending on rating), means of egress (capacity, travel distance, marking, emergency lighting), fire-prevention plans (1910.39), hot work (NFPA 51B permit), flammable liquids (bonding/grounding, storage limits), combustible dust awareness. HAZWOPER awareness-level concepts (1910.120): responder levels and the annual refresher.

Domain 5 — Environmental management

RCRA at generalist depth: waste identification (listed F/K/P/U vs. characteristic D001–D003/D-list), generator categories (VSQG/SQG/LQG thresholds and accumulation clocks), manifests, satellite accumulation. DOT hazmat: 9 classes, shipping papers, labels vs. placards (Table 1 any-quantity vs. Table 2 1,001-lb). EPCRA: Tier II (March 1), TRI/Form R (July 1). CWA: SPCC (1,320-gal threshold). CAA/RMP awareness. ISO 14001 structure.

Domain 6 — Health, wellness, and human factors

Occupational health programs: medical surveillance (when triggered — lead, asbestos, noise, respirators), fitness for duty, bloodborne pathogens (1910.1030: exposure control plan, universal precautions), hazard communication and GHS (SDS 16 sections, pictograms, training), ergonomics programs, workplace violence prevention, stress/fatigue management, total-worker-health concepts.

Domain 7 — Professional practice

Ethics (codes of conduct — integrity, competence boundaries, conflicts), risk communication (to workers, management, the public), training design (needs analysis, adult learning, Kirkpatrick evaluation), auditing (multi-media compliance audits), workers' compensation basics (experience modification rate — EMR — conceptually: <1.0 better than average), contractor safety management (prequalification, orientation, oversight).

Key equations

• TRIR = (recordables × 200,000)/hours; DART = (DART cases × 200,000)/hours.
• TWA = Σ(C_i·T_i)/8.
• Noise dose D = 100Σ(C/T); OSHA TWA = 16.61·log10(D/100) + 90.
• Mixture Σ(C_i/OEL_i) ≤ 1.
• MUC = APF × OEL.
• Dilution Q = G·K/C.
• EMR = actual losses / expected losses (conceptual).

Worked examples

Example 1 — Recordability. A worker cuts a finger; the clinic applies Steri-Strips (wound closure) — recordable (1904.7: wound closures beyond first aid). Had it been a Band-Aid alone — first aid, not recordable. A prescription antibiotic for an infected cut — recordable (prescription medication). The generalist must apply 1904.7's first-aid list precisely — the exam tests the boundary cases.

Example 2 — TWA and dual limits. CO: 4 h at 40 ppm, 4 h at 20 ppm. TWA = 30 ppm. PEL 50, TLV 25 → OSHA-compliant, ACGIH-exceeded. The generalist's recommendation: compliant but not best practice — engineer below the TLV (the exam rewards the two-standard analysis).

Example 3 — Extinguisher placement. Ordinary-hazard office: Class A extinguishers within 75 ft travel distance (2-A rating minimum per NFPA 10 for light/ordinary hazard). A server room adds Class C; a kitchenette with deep fryers adds Class K. The exam tests matching the extinguisher to the fire class and the travel distance.

Example 4 — Generator status. 250 kg/mo → SQG: 180-day clock, manifest, basic training and contingency plan. The generalist's audit finding when the 180-day clock is missed: the facility becomes an unpermitted storage facility — escalate immediately.

Example 5 — Noise. 90 dBA for 4 h, 85 dBA for 4 h (OSHA): T(90)=8, T(85)=16. D = 100×(4/8+4/16) = 75%. TWA = 16.61×log10(0.75)+90 ≈ 87.9 dBA — below PEL, above the 85 action level → hearing-conservation program (audiometry, training, protectors) required.

Standards/regulations cross-reference

• OSH Act / 29 CFR 1904, 1910, 1926 — the compliance core.
• ANSI/ASSP Z10.0 / ISO 45001 — management systems.
• ACGIH TLVs, NIOSH RELs — health-based limits.
• NFPA 10/101/51B/70E — fire and electrical.
• EPA RCRA/DOT/EPCRA — environmental.
• Related credentials: CSP (companion guide — deeper safety), CIH (deeper IH), CHMM (deeper hazmat), OHST (the technician tier below).

Pitfalls

1. First-aid vs. recordable. Memorize 1904.7's first-aid list — the boundary cases are exam favorites.
2. PEL/TLV/REL confusion. Legal vs. recommended vs. consensus — know which drives compliance and which drives best practice.
3. Hierarchy order. PPE last — scenario questions punish PPE-first answers.
4. Generator clocks. 90/180 days run from when waste is first placed in central accumulation — satellite time is separate.
5. Generalist trap. The exam rewards correct triage (what program applies, what the next step is, when to call a specialist) over specialist depth — answer as the coordinator, not the CIH.

Exam strategy

• Breadth over depth: the generalist exam samples all domains — allocate study time by blueprint weight, not personal interest.
• Calculation set: TRIR, TWA, noise dose, mixture, MUC — five formulas, drilled to automaticity.
• Verify the handbook: confirm the current exam's question count, duration, blueprint weights, and eligibility rules — this guide's technical content is stable, but administrative details change.

Practice problems

1. Steri-Strips vs. butterfly bandage vs. prescription ibuprofen: which are recordable under 1904.7?
2. 6 recordables, 500,000 hours: TRIR? The industry average is 3.0 — interpret.
3. Toluene 50 ppm TWA (PEL 200, TLV 20): compliance assessment and recommendation.
4. A lab generates 80 kg/mo hazardous waste: category, accumulation rule, manifest needed?
5. Explain the generalist's role when air sampling shows exposures at 80% of the TLV. (Short essay.)
6. Match: deep-fryer fire, energized server rack, magnesium machining — extinguisher classes and why.

Answers

1. Steri-Strips (wound closure): recordable. Butterfly bandage (first aid): not recordable. Prescription ibuprofen at prescription strength: recordable (prescription medication); the same drug OTC at OTC dose: first aid.
2. TRIR = (6×200,000)/500,000 = 2.4 — better than the 3.0 average, but the rate alone doesn't prove the program is effective (check severity, near-miss trends, and whether the hours base is stable).
3. OSHA-compliant (50 < 200), exceeds TLV (20) by 2.5× → best practice violated; recommend engineering controls/substitution to get below the TLV; document the ALARA-style rationale.
4. VSQG (≤100 kg/mo): no manifest required federally, no accumulation time limit within the quantity cap (≤1,000 kg on-site); still must not dispose via non-hazardous routes — send to an authorized facility; check state rules (many states tighten VSQG).
5. 80% of TLV: compliant but in the action zone — the generalist triggers enhanced monitoring (confirm the upper tail, not just the mean), reviews controls for degradation, considers whether the SEG is correctly drawn, and sets a re-monitoring schedule; if the trend rises, intervene before exceedance. Also: communicate honestly — "compliant with margin narrowing" — not "safe."
6. Deep fryer: Class K (wet chemical — saponification; water/ABC dry chemical dangerous). Energized server rack: Class C (non-conductive agent — CO₂ or clean agent; de-energize if possible). Magnesium: Class D (special dry powder — water and ABC react violently with burning metal).

Original ETS reference writing, verified against public sources on 2026-09-30. Thin sourcing is flagged inline. Not legal advice — confirm current editions with the issuing body.