The decision could complicate states’ ability to pursue groundwater natural resource damages actions.
By Kegan A. Brown, Gary P. Gengel, Thomas C. Pearce, and Taylor R. West
On November 22, 2021, the US Supreme Court held that equitable apportionment applies to a dispute between states about their respective interests in groundwater that flows through multiple states in Mississippi v. Tennessee.[1] The decision may have implications for natural resource damages (NRD) claims. Natural resource trustees often assert claims to pursue damages to groundwater. In assessing these claims, courts often must determine (1) whether the trustee has a trusteeship interest in the groundwater resource at issue, and (2) if so, the extent of the trustee’s interest in that groundwater resource relative to the interests of other trustees in the same groundwater.
The California Office of Administrative Law recently approved a suite of amendments to the CEQA Guidelines, which are now in effect. 
Over the past month, two US Courts of Appeals have rejected Clean Water Act (CWA) citizen suits seeking to hold power companies liable for discharges of pollutants from coal ash disposal facilities “through” groundwater to waters of the US. Although the Fourth Circuit accepted that discharges through groundwater could be the basis for liability, it held that the relevant ash piles and impoundments were not “point sources” for purposes of the CWA. The Sixth Circuit likewise held that the ash disposal facilities at issue were not point sources, but — contrary to the Fourth Circuit — also held that discharges through groundwater were not actionable under the Act. Collectively, these recent decisions stand as a significant new obstacle to citizen suits against owner/operators of coal ash impoundments. At the same time, the decisions deepen a circuit split on the so-called “groundwater conduit” theory of CWA liability, helping to tee the issue up for possible Supreme Court resolution. If the Court does take this question up, the outcome will be critically important for many industry sectors, including electric power, oil and gas, manufacturing, and mining companies, among others. The CWA imposes strict liability, and citizen suits based on groundwater conduit claims can result in extremely costly remedies — including large civil penalties and injunctive relief.
New regulations governing the implementation of the Safe Drinking Water and Toxic Enforcement Act of 1986 (Prop 65) will go into effect on August 30, 2018 that apply to products manufactured after the operative date of August 30, 2018. The new regulations update the content of the Prop 65 warning label that appears on products, in addition to other substantive changes.
On August 27, 2018, the US Department of the Interior (DOI) issued an Advance Notice of Proposed Rulemaking (ANPR) requesting 
Water management is becoming increasingly critical amid increasing oil and gas production in the Permian Basin and other regions of the United States. In particular, many companies are now seeking to manage larger quantities of produced water, and/or to secure water supplies for drilling activities — leading
Chinese authorities have been increasing their efforts to prosecute environmental offenders along the Yangtze River, the third-longest river in the world and the longest in Asia. The crackdown reflects China’s goal to make 70% of its surface water safe to consume by 2020.