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Heptachlor in U.S. tap water
23 public water systems across 4 U.S. states report Heptachlor in their annual Consumer Confidence Report. None currently sit at or above the federal limit.
Within the federal limit (23)
Frequently asked
+What is Heptachlor?
Heptachlor 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 in drinking water?
The federal MCLG for Heptachlor is 0 ng/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 over the federal limit?
Zero of the 23 public water systems in The Water Map dataset currently report Heptachlor at or above its federal limit.
+How can I check if Heptachlor 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.