On June 26, 2019, EPA published a Notice of Proposed Rulemaking requesting comment on a proposed Maximum Contaminant Level (MCL) for perchlorate under the Safe Drinking Water Act (SDWA). Perchlorate is both a man-made and naturally-occurring chemical, most commonly found in industrial operations associated with the use or manufacture of rocket fuel, missiles and fireworks. Perchlorate inhibits the uptake of iodide to the thyroid and has been detected in certain public water supply systems, primarily in the western United States. In its Notice, EPA proposes an MCL of 56 µg/L, but at the same time requests public comment on whether the MCL should be set at a higher or lower standard, or whether the agency should re-evaluate its decision to regulate perchlorate based on updated data. This rule, if finalized, could affect thousands of public water systems that would be required to comply with the new standard, as well as state and tribal agencies responsible for drinking water regulatory development and enforcement.
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On April 12, 2019, the Fifth Circuit issued its opinion in Southwestern Elec. Power Co. v. EPA, ordering EPA to reconsider parts of its 2015 Effluents Limitations Guidelines and Standards for the Steam Electric Power Generating Point Source Category (“2015 ELG Rule”). The opinion resolves a challenge brought by environmental groups regarding the rule’s effluent limitation guidelines for “legacy” wastewater and for combustion residual leachate from landfills or settling ponds.

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On April 15, 2019, EPA issued its long-awaited Interpretative Statement addressing the Clean Water Act’s applicability to releases of pollutants from point sources into groundwater that subsequently migrate to jurisdictional surface waters. The question this interpretation addresses stems from the 2018 federal circuit split previously discussed here. On February 19, 2019, the Supreme Court granted certiorari in one of the cases that contributed to the split, County of Maui v. Hawai’i Wildlife Fund. The United States filed its amicus brief in that case, urging the highest court to review County of Maui, but not a similar ruling from the Fourth Circuit. As the question was being reviewed by the federal courts, EPA requested public comment on this issue and received over 50,000 comments. EPA is addressing some of these comments in the Interpretative Statement.
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On March 8, 2019, the Environmental Protection Agency, Department of the Army, and Army Corps of Engineers petitioned the U.S. Courts of Appeals for the 4th and 9th Circuits to voluntarily dismiss their appeals of the Suspension rule. This is yet another development in the litigation surrounding the 2015 Waters of the United States Rule (WOTUS). Our previous blog posts on this topic can be accessed here.
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