40 Protection of Environment 21 2004-07-01 2004-07-01 false What criteria must a State use to determine that a profile is unnecessary? 141.531 Section 141.531 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) WATER PROGRAMS (CONTINUED) NATIONAL PRIMARY DRINKING WATER REGULATIONS Enhanced Filtration and Disinfection-Systems Serving Fewer Than 10,000 People Disinfection Profile
§ 141.531 What criteria must a State use to determine that a profile is unnecessary?

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.

Effective Date Note:

At 69 FR 38856, June 29, 2004, § 141.531 was amended by adding a sentence to the end of the section, effective July 29, 2004. For the convenience of the user, the added text is set forth as follows:

§ 141.531 What criteria must a State use to determine that a profile is unnecessary?

* * * Your State may approve a more representative TTHM and HAA5 data set to determine these levels.