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Site Identification <br />MOUNTAIN HOUSE CSD WATER TREATMENT <br />18045 S KELSO RD <br />BYRON, CA 94514 <br />CERS ID <br />10184631 <br />CAL000435189 <br />EPA ID Number <br />County <br />San Joaquin <br />Hazardous Materials <br />Does your facility have on site (for any purpose) at any one time, hazardous materials at or above 55 gallons for liquids, 500 pounds for solids, or 200 <br />cubic feet for compressed gases (include liquids in ASTs and USTs); or is regulated under more restrictive inventory local reporting requirements <br />(shown below if present); or the applicable Federal threshold quantity for an extremely hazardous substance specified in 40 CFR Part 355, Appendix <br />A or B; or handle radiological materials in quantities for which an emergency plan is required pursuant to 10 CFR Parts 30, 40 or 70? <br />Yes <br />Underground Storage Tank(s) (UST) <br />Does your facility own or operate underground storage tanks? No <br />Hazardous Waste <br />Is your facility a Hazardous Waste Generator?Yes <br />NoDoes your facility treat hazardous waste on-site? <br />NoIs your facility's treatment subject to financial assurance requirements (for Permit by Rule and Conditional Authorization)? <br />NoDoes your facility consolidate hazardous waste generated at a remote site? <br />NoDoes your facility need to report the closure/removal of a tank that was classified as hazardous waste and cleaned on-site? <br />NoDoes your facility generate in any single calendar month 1,000 kilograms (kg) (2,200 pounds) or more of federal RCRA hazardous waste, or generate <br />in any single calendar month greater than 1 kg (2.2 pounds) of RCRA acute hazardous waste; or generate more than 100 kg (220 pounds) of spill <br />cleanup materials contaminated with RCRA acute hazardous waste. <br />NoIs your facility a Household Hazardous Waste (HHW) Collection site? <br />Excluded and/or Exempted Materials <br />Does your facility recycle more than 100 kg/month of excluded or exempted recyclable materials (per HSC 25143.2)? No <br />Additional Information <br />No additional comments provided. <br />Submittal Status <br />Submitted on 9/22/2025 by Jack Becker of MOUNTAIN HOUSE CSD (MOUNTAIN HOUSE, CA) <br />Aboveground Petroleum Storage <br />Does your facility own or operate aboveground petroleum storage tanks or containers AND: <br />* have a total aboveground petroleum storage capacity of 1,320 gallons or more, OR <br />* have one or more petroleum tanks in an underground area? <br />Yes <br />Regulated Substances <br />Does your facility have Regulated Substances stored onsite in quantities greater than the threshold quantities established by the California Accidental <br />Release prevention Program (CalARP)? <br />Yes <br />California Environmental Reporting System (CERS)Business Activities <br />Printed on 9/24/2025 3:46 PM