25 Pa. Code § 96.5 - Nutrient discharges
(a)
Whenever technically and financially feasible, and environmentally sound, land
disposal of wastewater shall be used on a continuous or seasonal basis to
prevent or minimize to the maximum extent practicable the discharge of
nutrients to surface waters, including tributaries thereof, that are determined
to be either threatened or impaired by nutrient enrichment.
(b) When necessary to control eutrophication
in a lake, pond, or other impoundment, the Department will develop a TMDL and
associated WLAS and LAS based on average annual loading estimates.
(c) When it is determined that the discharge
of phosphorus, alone or in combination with the discharge of other pollutants,
contributes or threatens to impair existing or designated uses in a free
flowing surface water, phosphorus discharges from point source discharges shall
be limited to an average monthly concentration of 2 mg/l. More stringent
controls on point source discharges may be imposed, or may be otherwise
adjusted as a result of a TMDL which has been developed.
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