Physical & aggregate · 2024
pH in Ontario, CA tap water
Ontario, CA's 2024 report shows pH detected, but the EPA has not set an enforceable federal limit for it.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Reported level Local Groundwater | 7.9 | None set |
Reported level OMUC's Entire Distribution System | 7.8 | 6.5 MCL |
Reported level Imported Water (WFA w/ SAWCO) | 7.7 | None set |
Verbatim from Ontario, CA's 2024 Consumer Confidence Report — source document ↗
About pH
A measure of how acidic or basic the water is.
Regulated only as a secondary standard; very low or high pH can corrode pipes or affect taste.
How Ontario, CA compares
5 of the 123 systems measuring pH on The Water Map have it at or above the federal limit:
Nearby systems also reporting pH:
People also ask
+Is there pH in Ontario, CA tap water?
Yes — Ontario, CA's 2024 Consumer Confidence Report lists pH at 7.9. Ontario, CA's 2024 report shows pH detected, but the EPA has not set an enforceable federal limit for it.
+What's the federal limit for pH in drinking water?
The federal MCL for pH is 6.5 . The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+What is pH?
A measure of how acidic or basic the water is. Regulated only as a secondary standard; very low or high pH can corrode pipes or affect taste.
+Which other U.S. cities have pH over the federal limit?
5 of the 123 systems on The Water Map measuring pH report it at or above the federal limit. Examples include High Point, NC, Phoenix, AZ, Billings, MT.
+Where does this pH measurement come from?
This page reproduces the pH entry from the 2024 Consumer Confidence Report published by the Ontario, 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/ontario/2024/source.