Lehigh Southwest Cement Company and Hanson Permanente Cement, Inc., Permanente Plant, Cupertino, Santa Clara County – NPDES Permit Reissuance

The San Francisco Bay Regional Water Quality Control Board is overseeing the National Pollutant Discharge Elimination System (NPDES) permit reissuance, identified as Regional Water Board Order R2-2026-0015, for the Permanente Plant in Cupertino, Santa Clara County. Operated by Lehigh Southwest Cement Company and Hanson Permanente Cement, Inc., the facility is a limestone quarry and former cement production site that currently produces construction aggregate. The primary objective of this action is to regulate the discharge of industrial stormwater, treated quarry dewatering water, truck and equipment wash water, and aggregate crushing and washing water into upper Permanente Creek. The permit specifies three distinct shallow-water outfall locations for these discharges, identified by coordinates 37.31713, -122.11165; 37.31899, -122.08750; and 37.31713, -122.087159. This project is classified as a forecast under NAICS code 541620 and is exempt from certain requirements under Section 13389 of the California Water Code as it involves the adoption of an NPDES permit. John H. Madigan serves as the primary point of contact and Water Resource Control Engineer for the lead agency.