Drinking water quality · 2020
· Verified
What's in Gswc - Claremont — San Dimas, Ca, CA tap water
16 contaminants were measured in the Gswc - Claremont — San Dimas, Ca, CA water system's 2020 annual report. Each is shown below against its federal limit — 1 sit at or above that limit.
- Reporting year
- 2020
- Contaminants measured
- 16
- Over federal limit
- 1
- Approaching the limit
- 0
- Worst contaminant
- PFOA
- Service area
- CA
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. | 4.7 ng/LAverageSystem-wide | 5.1 ng/LNL | At or above the limit |
| Perfluorohexanoic acidPerfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.' | 5.8 ng/LAverageSystem-wide | None set | Detected — no federal limit |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 39 ug/LAverageSystem-wide | None set | Within the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 37AverageSystem-wide | None set | Detected — no federal limit |
| PerchlorateA chemical used in rocket fuel and fireworks that can also form during disinfection. | Not detectedAverageSystem-wide | None set | Detected — no federal limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 4.2 mg/LAverageSystem-wide | 10 mg/LMCL | Within the limit |
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.31 mg/LAverageSystem-wide | 4 mg/LMCL | Within the limit |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 1.5 mg/LAverageSystem-wide | 4 mg/LMCL | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 0.23 ug/L90th percentileAt the tap | None set | Within the limit |
| CopperA metal that enters water from corroding household plumbing. | Not detected mg/L90th percentileAt the tap | 1.3 mg/LAction level | None detected |
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | Not detectedAverageSystem-wide | None set | Detected — no federal limit |
| ManganeseA naturally occurring metal from soil and rock. | 1.8AverageSystem-wide | None set | Detected — no federal limit |
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| DBCP1,2-dibromo-3-chloropropane — a banned soil fumigant pesticide. | Not detected ng/LAverageSystem-wide | None set | Within the limit |
| TrichloroethyleneAn industrial solvent (TCE) used in metal degreasing. | Not detectedAverageSystem-wide | 5MCL | Detected — no federal limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross Beta Particle ActivityGross beta particle activity — a combined measure of beta-emitting radioactive substances. | Not detected pCi/LAverageSystem-wide | None set | Detected — no federal limit |
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | 1.6 pCi/LAverageSystem-wide | 20 pCi/LMCL | Detected — no federal limit |
People also ask about Gswc - Claremont — San Dimas, Ca, CA's water
+Is Gswc - Claremont — San Dimas, Ca, CA tap water safe to drink in 2020?
The 2020 Consumer Confidence Report for the Gswc - Claremont — San Dimas, Ca, CA water utility lists 1 contaminant at or above the federal limit: PFOA. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.
+What contaminants are in Gswc - Claremont — San Dimas, Ca, CA tap water?
16 contaminants were measured in Gswc - Claremont — San Dimas, Ca, CA's 2020 Consumer Confidence Report, spanning metals, disinfection byproducts, and inorganic chemicals. 7 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Which contaminants exceed federal limits in Gswc - Claremont — San Dimas, Ca, CA tap water?
One contaminant in Gswc - Claremont — San Dimas, Ca, CA's 2020 report sits at or above the federal limit: PFOA (1.2× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.
+What is the worst contaminant in Gswc - Claremont — San Dimas, Ca, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2020 report is PFOA, at 1.2× the federal threshold. It belongs to the pfas ("forever chemicals") family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from Gswc - Claremont — San Dimas, Ca, CA's 2020 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Gswc - Claremont — San Dimas, Ca, CA's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2020 report; a new report will replace it once the utility publishes its next annual update.