§141.551. What strengthened combined filter effluent turbidity limits must my system meet?
40 C.F.R. § 141.551
Your system must meet two strengthened combined filter effluent turbidity limits.
The first combined filter effluent turbidity limit is a “95th percentile” turbidity limit that your system must meet in at least 95 percent of the turbidity measurements taken each month. Measurements must continue to be taken as described in § 141.74(a) and (c). Monthly reporting must be completed according to § 141.570. The following table describes the required limits for specific filtration technologies.
The second combined filter effluent turbidity limit is a “maximum” turbidity limit which your system may at no time exceed during the month. Measurements must continue to be taken as described in § 141.74(a) and (c). Monthly reporting must be completed according to § 141.570. The following table describes the required limits for specific filtration technologies.
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]