Which CFR Part addresses wastewater?

• A. CFR 136.
• B. CFR 141.
• C. CFR 101.
• D. CFR 99.

Answer: (A)

Regulatory testing of wastewater relies on standardized lab methods approved by the EPA, and the CFR part that governs these test procedures is 40 CFR Part 136. This part lists the approved methods used to analyze pollutants in water and wastewater, ensuring data quality and comparability across laboratories and over time. By specifying the exact methods and when they are valid to use, Part 136 provides the foundation for determining whether a facility's effluent meets permit limits under the Clean Water Act. The other parts focus on different regulatory areas—drinking water regulations or other environmental programs—so they do not set the wastewater analysis procedures.