Disinfection byproducts · 2025
HAA5 in City of Poquoson, VA tap water
City of Poquoson, VA's 2025 HAA5 measurement is below the federal limit of 60 ug/L (MCL).
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Maximum Max Detected Level | 7.8 ug/L | 60 ug/L MCL |
Range System-wide | 0–7.8 ug/L | 60 ug/L MCL |
Reported level System-wide | 21 ug/L | 60 ug/L MCL |
Range Range of Individual Test Results Low | 5–32 ug/L | 60 ug/L MCL |
Verbatim from City of Poquoson, VA's 2025 Consumer Confidence Report — source document ↗
About HAA5
Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter.
Long-term exposure above the federal limit is associated with an increased cancer risk.
How City of Poquoson, VA compares
Nearby systems also reporting HAA5:
People also ask
+Is there HAA5 in City of Poquoson, VA tap water?
Yes — City of Poquoson, VA's 2025 Consumer Confidence Report lists HAA5 at 5–32 ug/L. City of Poquoson, VA's 2025 HAA5 measurement is below the federal limit of 60 ug/L (MCL).
+What's the federal limit for HAA5 in drinking water?
The federal MCL for HAA5 is 60 ug/L. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+What is HAA5?
Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. Long-term exposure above the federal limit is associated with an increased cancer risk.
+Where does this HAA5 measurement come from?
This page reproduces the HAA5 entry from the 2025 Consumer Confidence Report published by the City of Poquoson, VA water utility — the annual drinking-water report every U.S. utility is required by federal law to publish. The original source document is archived at /water/va/poquoson/2025/source.