GroundRules
40 CFR 141.531: What criteria must a State use to determine that a profile is unnecessary?
Where this section sits in the code
- Title 40—Protection of Environment
- CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY
- SUBCHAPTER D—WATER PROGRAMS
- PART 141—NATIONAL PRIMARY DRINKING WATER REGULATIONS
- Subpart T—Enhanced Filtration and Disinfection—Systems Serving Fewer Than 10,000 People
States may only determine that a system's profile is unnecessary if a system's TTHM and HAA5 levels are below 0.064 mg/L and 0.048 mg/L, respectively. To determine these levels, TTHM and HAA5 samples must be collected after January 1, 1998, during the month with the warmest water temperature, and at the point of maximum residence time in your distribution system. Your State may approve a more representative TTHM and HAA5 data set to determine these levels.
Collected 2026-08-27T02:26:04Z. Source file · JSON