Disinfection byproducts · 2022
TTHM in City of Arroyo Grande Utilities Division — Arroyo Grande, Ca, CA tap water
City of Arroyo Grande Utilities Division — Arroyo Grande, Ca, CA's 2022 TTHM measurement is below the federal limit of 80 ug/L (MCL).
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Range Lopez WTP | 42–97 ug/L | 80 ug/L MCL |
Average Lopez WTP | 57.8 ug/L | 80 ug/L MCL |
Range State Water | 24–77 ug/L | 80 ug/L MCL |
Average State Water | 54 ug/L | 80 ug/L MCL |
Range Groundwater | 46.6–78.7 ug/L | 80 ug/L MCL |
Average Groundwater | 57.9 ug/L | 80 ug/L MCL |
Verbatim from City of Arroyo Grande Utilities Division — Arroyo Grande, Ca, CA's 2022 Consumer Confidence Report — source document ↗
About TTHM
Total trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter.
Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.
How City of Arroyo Grande Utilities Division — Arroyo Grande, Ca, CA compares
4 of the 251 CA systems measuring TTHM on The Water Map have it at or above the federal limit:
Nearby systems also reporting TTHM:
People also ask
+Is there TTHM in City of Arroyo Grande Utilities Division — Arroyo Grande, Ca, CA tap water?
Yes — City of Arroyo Grande Utilities Division — Arroyo Grande, Ca, CA's 2022 Consumer Confidence Report lists TTHM at 57.9 ug/L. City of Arroyo Grande Utilities Division — Arroyo Grande, Ca, CA's 2022 TTHM measurement is below the federal limit of 80 ug/L (MCL).
+What's the federal limit for TTHM in drinking water?
The federal MCL for TTHM is 80 ug/L. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+What is TTHM?
Total trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.
+Which other U.S. cities have TTHM over the federal limit?
4 of the 251 CA systems on The Water Map measuring TTHM report it at or above the federal limit. Examples include Suisun-solano Water Authority — Vacaville, Ca, CA, Sweetwater Authority — Chula Vista, Ca, CA, Crestline Village Cwd - Division 10 — Crestline, Ca, CA.
+Where does this TTHM measurement come from?
This page reproduces the TTHM entry from the 2022 Consumer Confidence Report published by the City of Arroyo Grande Utilities Division — Arroyo Grande, Ca, CA 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/ca/arroyo-grande-utilities-division-arroyo-grande-ca/2022/source.