A district court granted partial summary judgment for environmental groups in a CWA citizen suit concerning water quality standards for mercury in Idaho. The groups argued that EPA's failure…

A district court upheld EPA’s refusal to determine whether new water quality standards were necessary to control nitrogen and phosphorus pollution in the mainstem of the Mississippi River and the…

A district court held that EPA does not have a mandatory duty to review an amendment to the Pennsylvania Sewage Facilities Act under the CWA. The amendment allows the use of certain on-lot sewage…

A district court ordered EPA to conduct a necessity determination under CWA §303(c)(4)(B) in response to an environmental group's petition asking the Agency to establish water quality…

A district court remanded to EPA its determination that several provisions of Florida's "impaired water rule" are not new or revised water quality standards and, thus, not subject…

A district court upheld EPA's rule setting numeric nutrient criteria for Florida except in two respects: the stream criteria and the default downstream-protection criteria for unimpaired…