Drinking water quality · 2024
· Verified
What's in Fontana, CA tap water
35 contaminants were measured in the Fontana, CA water system's 2024 annual report. Each is shown below against its federal limit — 4 sit at or above that limit.
- Reporting year
- 2024
- Contaminants measured
- 35
- Over federal limit
- 4
- Approaching the limit
- 0
- Worst contaminant
- Specific Conductance
- Service area
- CA
- Specific ConductancePhysical & aggregate · Average404.5limit 1 · 404.5× the limit
- CopperMetals · 90th percentile260 ug/Llimit 1 ug/L · 260.0× the limit
- Total Dissolved SolidsPhysical & aggregate · Average219.5 mg/Llimit 1 mg/L · 219.5× the limit
- Chromium, HexavalentMetals · Average0.83 ug/Llimit 0.02 ug/L · 41.5× the limit
Where your water comes from · EPA SDWIS
Fontana, CA's drinking water comes from ground water, drawn from 35 sources.
Source
- SWP RAW - COMBINED INFLUENT
- WELL F-54A
- WELL F-10D
- WELL F-21B
- + 31 more
Treatment
- F-23 IX TP
- WELL F-13A - TREATED
- WELL F-13B - TREATED
- + 27 more
Distribution
Also buys water from CUCAMONGA VALLEY WATER DISTRICT.
Historical readings · EPA Six-Year Review (2012–2019)
4 contaminants historically over EPA limits in 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 |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 404.5AverageSystem-wide | 1MCL | At or above the limit |
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 219.5 mg/LAverageSystem-wide | 1 mg/LMCL | At or above the limit |
| OdorA measure of detectable smell in the water. | 0.97AverageSystem-wide | 3MCL | Within the limit |
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.08 NTUAverageSystem-wide | 5 NTUMCL | Within the limit |
| ColorA measure of visible tint in the water. | 0.04AverageSystem-wide | 15MCL | Within the limit |
| AlkalinityA measure of the water's capacity to neutralize acids. | 162 mg/LAverageSystem-wide | None set | Detected — no federal limit |
| HardnessA measure of dissolved calcium and magnesium minerals. | 148.3 mg/LAverageSystem-wide | None set | Detected — no federal limit |
| pHA measure of how acidic or basic the water is. | 7.89AverageSystem-wide | None set | Detected — no federal limit |
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 0.94 mg/LAverageSystem-wide | None set | Detected — no federal limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 0.83 ug/LAverageSystem-wide | 0.02 ug/LPublic health goal | At or above the limit |
| IronA naturally occurring metal common in groundwater. | 15.5 ug/LAverageSystem-wide | 300 ug/LMCL | Within the limit |
| AluminumA common element sometimes used as a treatment coagulant. | 3.71 ug/LAverageSystem-wide | 200 ug/LMCL | Within the limit |
| ManganeseA naturally occurring metal from soil and rock. | 0.12 ug/LAverageSystem-wide | 50 ug/LMCL | Within the limit |
| BoronA naturally occurring element from rock and soil. | 50 ug/LAverageSystem-wide | None set | Detected — no federal limit |
| CalciumA naturally occurring mineral that contributes to water hardness. | 47.21 mg/LAverageSystem-wide | None set | Detected — no federal limit |
| MagnesiumA naturally occurring mineral that contributes to water hardness. | 9.05 mg/LAverageSystem-wide | None set | Detected — no federal limit |
| PotassiumA naturally occurring mineral from rock and soil. | 2.65 mg/LAverageSystem-wide | None set | Detected — no federal limit |
| SodiumA naturally occurring salt component. | 27 mg/LAverageSystem-wide | None set | Detected — no federal limit |
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TetrachloroethyleneAn industrial solvent (PCE) used in dry cleaning and degreasing. | 0.02 ug/LAverageSystem-wide | 0.06 ug/LPublic health goal | Within the limit |
| XylenesA group of industrial solvents found in gasoline and paint. | 0.05 ug/LAverageSystem-wide | 1 ug/LPublic health goal | Within the limit |
| Dichlorodifluoromethane | 0.12 ug/LAverageSystem-wide | None set | Detected — no federal limit |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 0.97 mg/LAverageSystem-wide | 4 mg/LPublic health goal | Within the limit |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PerchlorateA chemical used in rocket fuel and fireworks that can also form during disinfection. | 0.1 ug/LAverageSystem-wide | 1 ug/LPublic health goal | Within the limit |
Inorganic chemicals
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals. | 0 %Highest single samplePercentage of Positive Samples Collected | 0 %Public health goal | None detected |
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 2 %Highest single samplePercentage of Positive Samples Collected | 0 %Public health goal | Detected — no federal limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 0.83 pCi/LAverageSystem-wide | 0 pCi/LPublic health goal | Detected — no federal limit |
People also ask about Fontana, CA's water
+Is Fontana, CA tap water safe to drink in 2024?
The 2024 Consumer Confidence Report for the Fontana, CA water utility lists 4 contaminants at or above the federal limit: Specific Conductance, Copper, Total Dissolved Solids, and Chromium, Hexavalent. 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 Fontana, CA tap water?
35 contaminants were measured in Fontana, CA's 2024 Consumer Confidence Report, spanning metals, physical & aggregate, and inorganic chemicals. 25 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 Fontana, CA tap water?
4 contaminants in Fontana, CA's 2024 report sit at or above the federal limit: Specific Conductance (404.5× the limit); Copper (260.0× the limit); Total Dissolved Solids (219.5× the limit); Chromium, Hexavalent (41.5× 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 Fontana, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2024 report is Specific Conductance, at 404.5× the federal threshold. It belongs to the physical & aggregate family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from Fontana, CA's 2024 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 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 2024 report; a new report will replace it once the utility publishes its next annual update.