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Enactment of the 1972 [[Clean Water Act]] required thousands of facilities to obtain permits for discharges to [[navigable]] waters, through the [[Clean Water Act#NPDES permits for point sources|National Pollutant Discharge Elimination System (NPDES)]]. It also required EPA to establish national discharge standards for municipal [[sewage treatment]] plants, and for many industrial categories (the latter are called "[[effluent guidelines]].")<ref name="US CWA 1972">United States. Federal Water Pollution Control Amendments of 1972, {{USPL|92|500}}, {{USC|33|1251}} ''et seq.'' October 18, 1972.</ref>
Municipal and industrial permittees are required to regularly collect and analyze wastewater samples, and submit [[Discharge Monitoring Report]]s to a state agency or EPA.<ref>{{cite report |author=U.S. Environmental Protection Agency (EPA) |date=2010 |title=NPDES Permit Writers' Manual |url=https://www.epa.gov/npdes/npdes-permit-writers-manual |id=EPA-833-K-10-001 |pages=8–14}}</ref> Amendments in 1977 required stricter regulation of [[toxic]] pollutants.<ref>U.S. Clean Water Act of 1977, {{USPL|95|217}}, December 27, 1977. "Toxic Pollutants." Section 53. {{usc|33|1317}}</ref> In 1987 Congress expanded NPDES permit coverage to include municipal and industrial [[stormwater]] discharges.<ref>U.S. Water Quality Act of 1987, {{USPL|100|4}}, February 4, 1987. "Section 405. Municipal and Industrial Stormwater Discharges." {{USCSub|33|1342|p}}</ref> {{Details|United States regulation of point source water pollution}}
The Act also requires use of [[Best management practice for water pollution|best management practices]] for a wide range of other water discharges including [[nonpoint source pollution]]
====Land pollution====
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