Drinking water quality · 2025
· Verified
What's in San Gabriel Valley Wc - Fontana, CA tap water
105 contaminants were measured in the San Gabriel Valley Wc - Fontana, CA water system's 2025 annual report. Each is shown below against its federal limit.
- Reporting year
- 2025
- Contaminants measured
- 105
- Over federal limit
- 0
- Approaching the limit
- 0
- Service area
- CA
state-level CCR
Where your water comes from · EPA SDWIS
San Gabriel Valley Wc - Fontana, CA's drinking water comes from ground water, drawn from 35 sources.
Source
35ground water
- SWP RAW - COMBINED INFLUENT
- WELL F-54A
- WELL F-10D
- WELL F-21B
- + 31 more
Treatment
30treatment plants
- F-23 IX TP
- WELL F-13A - TREATED
- WELL F-13B - TREATED
- + 27 more
Distribution
2storage units
Also buys water from CUCAMONGA VALLEY WATER DISTRICT.
Source: EPA SDWIS facilities inventory. Methodology.
Historical readings · EPA Six-Year Review (2012–2019)
4 contaminants historically over EPA limits in San Gabriel Valley Wc - Fontana, CA
Every U.S. public water system reports compliance-monitoring data to EPA. The Six-Year Review releases the 2012–2019 window as a single dataset — here's what your system reported, year by year. Values shown are the highest detection per analyte per year, compared to the federal MCL.
| Contaminant | Worst detection | EPA limit | Years (2012–2019) |
|---|---|---|---|
DICHLOROMETHANE worst: 2018 | 0.015 mg/L 3.0× | 0.005 mg/L | '14'17'18 |
PCE worst: 2017 | 0.0076 mg/L 1.5× | 0.005 mg/L | '12'13'14'15'16'17'18'19 |
NITRATE worst: 2012 | 14.5 mg/L 1.4× | 10 mg/L | '12'13'14'15'16'17'18'19 |
NITRATE NITRITE worst: 2016 | 13 mg/L 1.3× | 10 mg/L | '16'17'18'19 |
TTHM worst: 2016 | 0.076 mg/L 95% | 0.08 mg/L | '12'13'14'15'16'17'18'19 |
ARSENIC worst: 2015 | 0.0062 mg/L within below national p90 | 0.01 mg/L | '12'13'14'15'16'17'18'19 |
HAA5 worst: 2019 | 0.03 mg/L within | 0.06 mg/L | '12'13'14'16'17'18'19 |
FLUORIDE worst: 2015 | 0.66 mg/L within | 4 mg/L | '12'13'14'15'16'17'18'19 |
DBCP worst: 2015 | 0.000013 mg/L within below national p90 | 0.0002 mg/L | '15'16 |
URANIUM worst: 2019 | 0.00522 ug/L within below national p90 | 30 ug/L | '13'18'19 |
COPPER worst: 2014 | 0.15 mg/L below national p90 | — | '14'17 |
LEAD worst: 2017 | 0.019 mg/L | — | '17 |
DBAA worst: 2012 | 0.0037 mg/L | — | '12'13'14'16'17'18'19 |
DCAA worst: 2012 | 0.0011 mg/L | — | '12'13'14'16'17'18'19 |
MBAA worst: 2014 | 0.0011 mg/L | — | '14'16 |
TCAA worst: 2013 | 0.0015 mg/L | — | '13'16'17'18'19 |
BROMODICHLOROMETHANE worst: 2012 | 0.0065 mg/L | — | '12'13'14'16'17'18'19 |
BROMOFORM worst: 2012 | 0.0085 mg/L | — | '12'13'14'16'17'18'19 |
CHLOROFORM worst: 2012 | 0.0035 mg/L | — | '12'13'14'16'17'18'19 |
DIBROMOCHLOROMETHANE worst: 2012 | 0.01 mg/L | — | '12'13'14'16'17'18'19 |
PWSID CA3610041 · Source: EPA Six-Year Review 4 (2012–2019). Values are the highest detection in each calendar year; non-detect years are omitted. Year tags above show every year with a detection.
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PerchlorateA chemical used in rocket fuel and fireworks that can also form during disinfection. | 3.5124999999999997 UG/LAverageOther | 6 UG/LMCL | Within the limit |
| N-Nitrosodi-n-butylamine | Not detected UG/LHighest single sampleEntry point | None set | None detected |
| NDMA | Not detected UG/LHighest single sampleOther | None set | None detected |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 3.82 PCI/LAverageOther | 15 PCI/LMCL | Within the limit |
| Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements. | Not detected PCI/LHighest single sampleSource water | None set | None detected |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 254.28571428571428 MG/LAverageSource water | 1000 MG/LMCL | Within the limit |
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 397.14285714285717 UMHO/CMAverageSource water | 1600 UMHO/CMMCL | Within the limit |
| ColorA measure of visible tint in the water. | 2.7142857142857144 UNITSAverageSource water | 15 UNITSMCL | Within the limit |
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.6 NTUAverageOther | 5 NTUMCL | Within the limit |
| OdorA measure of detectable smell in the water. | Not detected TONHighest single sampleOther | 3 TONMCL | None detected |
| AlkalinityA measure of the water's capacity to neutralize acids. | 138.76190476190476 MG/LAverageSource water | None set | Detected — no federal limit |
| HardnessA measure of dissolved calcium and magnesium minerals. | 162 MG/LAverageEntry point | None set | Detected — no federal limit |
| pHA measure of how acidic or basic the water is. | 7.74 PHAverageEntry point | None set | Detected — no federal limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 1.6075 UG/LAverageSource water | 10 UG/LMCL | Within the limit |
| IronA naturally occurring metal common in groundwater. | 19.75 UG/LAverageSource water | 300 UG/LMCL | Within the limit |
| ManganeseA naturally occurring metal from soil and rock. | 1.7285714285714284 UG/LAverageSource water | 50 UG/LMCL | Within the limit |
| AluminumA common element sometimes used as a treatment coagulant. | Not detected UG/LHighest single sampleEntry point | 1000 UG/LMCL | None detected |
| Antimony | Not detected UG/LHighest single sampleEntry point | 6 UG/LMCL | None detected |
| BariumA metal from erosion of natural deposits and industrial discharge. | Not detected UG/LHighest single sampleSource water | 1000 UG/LMCL | None detected |
| Beryllium | Not detected UG/LHighest single sampleSource water | 4 UG/LMCL | None detected |
| Cadmium | Not detected UG/LHighest single sampleSource water | 5 UG/LMCL | None detected |
| MercuryA toxic metal from erosion of natural deposits and industrial runoff. | Not detected UG/LHighest single sampleEntry point | 2 UG/LMCL | None detected |
| NickelA metal from natural deposits and industrial discharge. | Not detected UG/LHighest single sampleEntry point | 100 UG/LMCL | None detected |
| SeleniumA trace element from natural deposits and industrial discharge. | Not detected UG/LHighest single sampleSource water | 50 UG/LMCL | None detected |
| Thallium | Not detected UG/LHighest single sampleEntry point | 2 UG/LMCL | None detected |
| ZincA naturally occurring metal that can also enter water from corroding pipes. | Not detected UG/LHighest single sampleOther | 5000 UG/LMCL | None detected |
| BoronA naturally occurring element from rock and soil. | 32.142857142857146 UG/LAverageSource water | None set | Detected — no federal limit |
| CalciumA naturally occurring mineral that contributes to water hardness. | 29.5 MG/LAverageSource water | None set | Detected — no federal limit |
| MagnesiumA naturally occurring mineral that contributes to water hardness. | 8.14 MG/LAverageEntry point | None set | Detected — no federal limit |
| PotassiumA naturally occurring mineral from rock and soil. | 2.2 MG/LAverageEntry point | None set | Detected — no federal limit |
| SodiumA naturally occurring salt component. | 21 MG/LAverageSource water | None set | Detected — no federal limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| SulfateA naturally occurring mineral from rock and soil. | 19.86111111111111 MG/LAverageSource water | 500 MG/LMCL | Within the limit |
| ChlorideA naturally occurring salt compound. | 12.288888888888888 MG/LAverageSource water | 500 MG/LMCL | Within the limit |
| Asbestos | Not detected MFLHighest single sampleEntry point | 7 MFLMCL | None detected |
| Cyanide | Not detected UG/LHighest single sampleEntry point | 150 UG/LMCL | None detected |
| NitriteA compound from fertilizer runoff, sewage, and erosion of natural deposits. | Not detected MG/LHighest single sampleOther | 1 MG/LMCL | None detected |
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Carbofuran | Not detected UG/LHighest single sampleEntry point | 18 UG/LMCL | None detected |
| Carbon Tetrachloride | Not detected UG/LHighest single sampleOther | 0.5 UG/LMCL | None detected |
| Chlordane | Not detected UG/LHighest single sampleOther | 0.1 UG/LMCL | None detected |
| Chlorobenzene | Not detected UG/LHighest single sampleOther | 70 UG/LMCL | None detected |
| Chromium | Not detected UG/LHighest single sampleEntry point | 50 UG/LMCL | None detected |
| Cis Dichloroethylene 12 | Not detected UG/LHighest single sampleEntry point | 6 UG/LMCL | None detected |
| Deha | Not detected UG/LHighest single sampleEntry point | 400 UG/LMCL | None detected |
| Dehp | Not detected UG/LHighest single sampleSource water | 4 UG/LMCL | None detected |
| Dichloroethane 12 | Not detected UG/LHighest single sampleEntry point | 0.5 UG/LMCL | None detected |
| Dichloroethylene 11 | Not detected UG/LHighest single sampleSource water | 6 UG/LMCL | None detected |
| Dichloropropane 12 | Not detected UG/LHighest single sampleEntry point | 5 UG/LMCL | None detected |
| Dinoseb | Not detected UG/LHighest single sampleSource water | 7 UG/LMCL | None detected |
| Diquat | Not detected UG/LHighest single sampleOther | 20 UG/LMCL | None detected |
| Edb | Not detected UG/LHighest single sampleEntry point | 0.05 UG/LMCL | None detected |
| Endothall | Not detected UG/LHighest single sampleOther | 100 UG/LMCL | None detected |
| Endrin | Not detected UG/LHighest single sampleSource water | 2 UG/LMCL | None detected |
| Glyphosate | Not detected UG/LHighest single sampleOther | 700 UG/LMCL | None detected |
| Heptachlor | Not detected UG/LHighest single sampleSource water | 0.01 UG/LMCL | None detected |
| Heptachlor Epoxide | Not detected UG/LHighest single sampleSource water | 0.01 UG/LMCL | None detected |
| Hexachlorobenzene | Not detected UG/LHighest single sampleEntry point | 1 UG/LMCL | None detected |
| Hexachlorocyclopentadiene | Not detected UG/LHighest single sampleEntry point | 50 UG/LMCL | None detected |
| Mcaa | Not detected UG/LHighest single sampleDistribution | None set | None detected |
| Methoxychlor | Not detected UG/LHighest single sampleEntry point | 30 UG/LMCL | None detected |
| O Dichlorobenzene | Not detected UG/LHighest single sampleOther | 600 UG/LMCL | None detected |
| Oxamyl | Not detected UG/LHighest single sampleSource water | 50 UG/LMCL | None detected |
| P Dichlorobenzene | Not detected UG/LHighest single sampleEntry point | 5 UG/LMCL | None detected |
| Pcb Total | Not detected UG/LHighest single sampleSource water | 0.5 UG/LMCL | None detected |
| Pentachlorophenol | Not detected UG/LHighest single sampleSource water | 1 UG/LMCL | None detected |
| Picloram | Not detected UG/LHighest single sampleSource water | 500 UG/LMCL | None detected |
| Styrene | Not detected UG/LHighest single sampleOther | 100 UG/LMCL | None detected |
| Tce | Not detected UG/LHighest single sampleSource water | 5 UG/LMCL | None detected |
| Toxaphene | Not detected UG/LHighest single sampleEntry point | 3 UG/LMCL | None detected |
| Trans Dichloroethylene 12 | Not detected UG/LHighest single sampleSource water | 10 UG/LMCL | None detected |
| Trichlorobenzene 124 | Not detected UG/LHighest single sampleOther | 5 UG/LMCL | None detected |
| Trichloroethane 111 | Not detected UG/LHighest single sampleOther | 200 UG/LMCL | None detected |
| Trichloroethane 112 | Not detected UG/LHighest single sampleSource water | 5 UG/LMCL | None detected |
| Twofourd | Not detected UG/LHighest single sampleOther | 70 UG/LMCL | None detected |
| Vinyl Chloride | Not detected UG/LHighest single sampleEntry point | 0.5 UG/LMCL | None detected |
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| 1,2,3-TCP | Not detected UG/LHighest single sampleSource water | 0.005 UG/LMCL | None detected |
| AtrazineA widely used agricultural herbicide that reaches water through runoff. | Not detected UG/LHighest single sampleSource water | 1 UG/LMCL | None detected |
| Benzene | Not detected UG/LHighest single sampleOther | 1 UG/LMCL | None detected |
| Benzo(a)pyrene | Not detected UG/LHighest single sampleEntry point | 0.2 UG/LMCL | None detected |
| ChloroethaneA volatile organic compound used in some industrial processes. | Not detected UG/LHighest single sampleOther | None set | None detected |
| Chloromethane | Not detected UG/LHighest single sampleSource water | None set | None detected |
| Dalapon | Not detected UG/LHighest single sampleEntry point | 200 UG/LMCL | None detected |
| Ethylbenzene | Not detected UG/LHighest single sampleEntry point | 300 UG/LMCL | None detected |
| Simazine | Not detected UG/LHighest single sampleOther | 4 UG/LMCL | None detected |
| Toluene | Not detected UG/LHighest single sampleEntry point | 150 UG/LMCL | None detected |
| XylenesA group of industrial solvents found in gasoline and paint. | Not detected UG/LHighest single sampleEntry point | 1750 UG/LMCL | None detected |
| Dichlorodifluoromethane | 0.6890291262135922 UG/LAverageEntry point | None set | Detected — no federal limit |
Source: San Gabriel Valley Wc - Fontana, CA's 2025 Consumer Confidence Report — the annual drinking-water report every U.S. utility is required to publish. The numbers on this page are the utility's own. A water-quality report covers an entire service area, not a single address.
People also ask about San Gabriel Valley Wc - Fontana, CA's water
+Is San Gabriel Valley Wc - Fontana, CA tap water safe to drink in 2025?
Every one of the 105 contaminants measured in San Gabriel Valley Wc - Fontana, CA's 2025 Consumer Confidence Report is below its federal limit. "Safe" under the EPA's drinking-water standards is health-based, not aesthetic — but by those standards, no measured contaminant in this report exceeds its enforceable threshold. Individual health concerns (e.g. immunocompromised, infant, pregnancy) may warrant additional filtering regardless of compliance.
+What contaminants are in San Gabriel Valley Wc - Fontana, CA tap water?
105 contaminants were measured in San Gabriel Valley Wc - Fontana, CA's 2025 Consumer Confidence Report, spanning other, metals, and vocs & pesticides. 81 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Where does the data on this page come from?
Every value is transcribed from San Gabriel Valley Wc - Fontana, CA's 2025 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 San Gabriel Valley Wc - Fontana, 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 2025 report; a new report will replace it once the utility publishes its next annual update.
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