The Foundation Water Law Newsletter
(By Lisa Bruderly and Christina Puhnaty)
In early September 2022, the Pennsylvania House and Senate Environmental Resources and Energy standing committees (Standing Committees) and the Independent Regulatory Review Commission (IRRC) disapproved the proposed rulemaking to change the water quality criterion for manganese in Pennsylvania. The future of the rulemaking is now uncertain.
Proposed Changes to Manganese Water Quality Criterion
The proposed manganese rule would add a numeric water quality criterion for manganese of 0.3 mg/L to Table 5 at 25 Pa. Code § 93.8c, which is intended to “protect human health from the neurotoxicological effects of manganese.” Executive Summary at 1, “Final-Form Rulemaking: Water Quality Standards and Implementation—Manganese” (Aug. 9, 2022). Section 93.8c establishes human health and aquatic life criteria for toxic substances, meaning the Pennsylvania Department of Environmental Protection (PADEP) would be regulating manganese as a toxic substance. The existing criterion of 1.0 mg/L, which was established in 25 Pa. Code § 93.7 as a water quality criterion, would be deleted. The 0.3 mg/L criterion would apply to all surface waters in the commonwealth. PADEP identified the parties affected by the manganese rule to be “[a]ll persons, groups, or entities with proposed or existing point source discharges of manganese into surface waters of the Commonwealth.” Executive Summary at 3.
PADEP also specifically identified “[p]ersons who discharge wastewater containing manganese from mining activities” as affected parties, and expects that mining operators would need to perform additional treatment to meet this criterion. Id. Final amendments to treatment systems would be implemented through PADEP’s permitting process and other approval actions. Consulting and engineering firm Tetra Tech estimated the overall cost to the mining industry to achieve compliance with the 0.3 mg/L criterion “could range between $44–$88 million in annual costs (that is, for active treatment systems using chemical addition for manganese removal) and upwards of $200 million in capital costs.” Comment and Response Document at 213, “Water Quality Standard for Manganese and Implementation” (Aug. …
to $50 million per year, or a total of $1 billion over a 20-year period.