§141.531. What criteria must a State use to determine that a profile is unnecessary?
40 C.F.R. § 141.531
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.
Notes, amendments, and revision history
Amendments
[67 FR 1839, Jan. 14, 2002, as amended at 69 FR 38856, June 29, 2004]
Source
Source: 67 FR 1839, Jan. 14, 2002, unless otherwise noted.
Authority
Authority: 42 U.S.C. 300f, 300g-1, 300g-2, 300g-3, 300g-4, 300g-5, 300g-6, 300j-4, 300j-9, and 300j-11.
Source
Source: 40 FR 59570, Dec. 24, 1975, unless otherwise noted.
Amendments
[67 FR 1839, Jan. 14, 2002, as amended at 69 FR 38856, June 29, 2004]