Other
Heptachlor Epoxide in U.S. tap water
119 public water systems across 1 U.S. states report Heptachlor Epoxide in their annual Consumer Confidence Report. None currently sit at or above the federal limit.
Within the federal limit (119)
| Water system | Measured |
|---|---|
| Bakersfield, CA 2024 annual report | Not detected UG/L |
| Brentwood, CA 2025 annual report | Not detected UG/L |
| Brentwood, CA 2023 annual report | Not detected UG/L |
| Brentwood, CA 2024 annual report | Not detected UG/L |
| Burbank, CA 2024 annual report | Not detected UG/L |
| Burbank-city, Water Dept., CA 2026 annual report | Not detected UG/L |
| Burbank-city, Water Dept., CA 2025 annual report | Not detected UG/L |
| Burbank-city, Water Dept., CA 2023 annual report | Not detected UG/L |
| Cal-water Service Co.-chico, CA 2025 annual report | Not detected UG/L |
| Cal-water Service Co.-chico, CA 2023 annual report | Not detected UG/L |
| Cal-water Service Co.-chico, CA 2026 annual report | Not detected UG/L |
| City of Antioch, CA 2024 annual report | Not detected UG/L |
| City of Antioch, CA 2023 annual report | Not detected UG/L |
| City of Antioch, CA 2025 annual report | Not detected UG/L |
| City of Cupertino, CA 2023 annual report | Not detected UG/L |
| City of Cupertino, CA 2026 annual report | Not detected UG/L |
| City of Daly City, CA 2026 annual report | Not detected UG/L |
| City of Daly City, CA 2023 annual report | Not detected UG/L |
| City of Fairfield, CA 2025 annual report | Not detected UG/L |
| City of Fairfield, CA 2023 annual report | Not detected UG/L |
| City of Hayward, CA 2026 annual report | Not detected UG/L |
| City of Hemet, CA 2024 annual report | Not detected UG/L |
| City of Martinez, CA 2025 annual report | Not detected UG/L |
| City of Martinez, CA 2024 annual report | Not detected UG/L |
| City of Murrieta, CA 2024 annual report | Not detected UG/L |
| City of Perris, CA 2024 annual report | Not detected UG/L |
| City of Pittsburg, CA 2025 annual report | Not detected UG/L |
| City of Pittsburg, CA 2024 annual report | Not detected UG/L |
| City of Pittsburg, CA 2026 annual report | Not detected UG/L |
| City of San Jacinto, CA 2024 annual report | Not detected UG/L |
| City of San Jose - Evg/edv/coy, CA 2023 annual report | Not detected UG/L |
| City of San Jose - Evg/edv/coy, CA 2026 annual report | Not detected UG/L |
| City of Santa Clara, CA 2023 annual report | Not detected UG/L |
| City of Santa Clara, CA 2025 annual report | Not detected UG/L |
| City of Stockton, CA 2023 annual report | Not detected UG/L |
| City of Stockton, CA 2025 annual report | Not detected UG/L |
| City of Vacaville, CA 2026 annual report | Not detected UG/L |
| City of Vacaville, CA 2025 annual report | Not detected UG/L |
| City of Vacaville, CA 2023 annual report | Not detected UG/L |
| City of Vallejo, CA 2025 annual report | Not detected UG/L |
| City of Vallejo, CA 2023 annual report | Not detected UG/L |
| Concord, CA 2024 annual report | Not detected UG/L |
| Contra Costa Water District, CA 2023 annual report | Not detected UG/L |
| Contra Costa Water District, CA 2025 annual report | Not detected UG/L |
| Contra Costa Water District, CA 2026 annual report | Not detected UG/L |
| Cws - Visalia, CA 2025 annual report | Not detected UG/L |
| Cwsc Salinas, CA 2023 annual report | Not detected UG/L |
| Cwsc Salinas, CA 2025 annual report | Not detected UG/L |
| Cwsc Salinas, CA 2024 annual report | Not detected UG/L |
| Cwsc Salinas, CA 2026 annual report | Not detected UG/L |
Showing 50 of 119. The full list is in the JSON API.
Frequently asked
+What is Heptachlor Epoxide?
Heptachlor Epoxide is a contaminant some U.S. public water utilities measure and report in their annual Consumer Confidence Report.
+What is the federal limit for Heptachlor Epoxide in drinking water?
The federal MCL for Heptachlor Epoxide is 0.01 UG/L. The EPA enforces this against the regulated reporting statistic (typically a running annual average or 90th percentile), not a single-sample spike.
+How many U.S. water systems have Heptachlor Epoxide over the federal limit?
Zero of the 119 public water systems in The Water Map dataset currently report Heptachlor Epoxide at or above its federal limit.
+How can I check if Heptachlor Epoxide is in my city's tap water?
Search your city on The Water Map (https://www.thewatermap.com/) or browse the list on this page. Every U.S. public water utility is required to publish an annual Consumer Confidence Report that lists every contaminant it measured, including Heptachlor Epoxide.