Drinking water quality · 2024
· Verified
What's in Fairfield, CA tap water
22 contaminants were measured in the Fairfield, CA water system's 2024 annual report. Each is shown below against its federal limit.
- Reporting year
- 2024
- Contaminants measured
- 22
- Over federal limit
- 0
- Approaching the limit
- 0
- Service area
- CA
Where your water comes from · EPA SDWIS
Fairfield, CA's drinking water comes from surface water, drawn from 3 sources.
Source
- NBR WTP - NORTH BAY AQUEDUCT - RAW
- NBR WTP - PUTAH SOUTH CANAL - RAW
- WATERMAN WTP - PUTAH SOUTH CANAL - RAW
Treatment
- NORTH BAY REGIONAL WTP - TREATED
- WATERMAN WTP-FINISHED WATER
Distribution
Historical readings · EPA Six-Year Review (2012–2019)
2 contaminants historically over EPA limits in Fairfield, 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) |
|---|---|---|---|
CHROMIUM worst: 2013 | 0.152 mg/L 1.5× 15.2× the national p90 | 0.1 mg/L | '13'16'18'19 |
GROSS BETA worst: 2017 | 4.1 mrem/yr 1.0× | 4 mrem/yr | '17 |
TTHM worst: 2019 | 0.077 mg/L 96% | 0.08 mg/L | '12'13'14'15'16'17'18'19 |
ARSENIC worst: 2016 | 0.00468 mg/L within below national p90 | 0.01 mg/L | '12'13'14'15'16'18'19 |
CADMIUM worst: 2019 | 0.0023 mg/L within near national p90 | 0.005 mg/L | '12'13'19 |
HAA5 worst: 2019 | 0.024 mg/L within | 0.06 mg/L | '19 |
FLUORIDE worst: 2015 | 1.01 mg/L within | 4 mg/L | '12'13'14'15'16'17'18'19 |
BROMATE worst: 2017 | 0.002 mg/L within | 0.01 mg/L | '16'17 |
NITRATE worst: 2012 | 1.53 mg/L within | 10 mg/L | '12'13'14'17 |
NITRATE NITRITE worst: 2017 | 0.58 mg/L within | 10 mg/L | '17 |
URANIUM worst: 2018 | 0.00283 ug/L within below national p90 | 30 ug/L | '18 |
COPPER worst: 2014 | 0.107 mg/L below national p90 | — | '14'16'19 |
LEAD worst: 2014 | 0.0064 mg/L | — | '14'16'18'19 |
DBAA worst: 2019 | 0.0015 mg/L | — | '19 |
DCAA worst: 2019 | 0.012 mg/L | — | '19 |
MCAA worst: 2019 | 0.0022 mg/L | — | '19 |
TCAA worst: 2019 | 0.0093 mg/L | — | '19 |
BROMODICHLOROMETHANE worst: 2012 | 0.0049 mg/L | — | '12'13'14'15'16'17'18'19 |
CHLOROFORM worst: 2012 | 0.0063 mg/L | — | '12'13'14'15'16'17'18'19 |
DIBROMOCHLOROMETHANE worst: 2012 | 0.0032 mg/L | — | '12'13'14'15'16'17'18'19 |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ManganeseA naturally occurring metal from soil and rock. | 24 ug/LAverageDrinking Water | 50 ug/LMCL | Within the limit |
| AluminumA common element sometimes used as a treatment coagulant. | 72 ug/LAverageDrinking Water | 200 ug/LMCL | Within the limit |
| IronA naturally occurring metal common in groundwater. | 21 ug/LAverageDrinking Water | 300 ug/LMCL | Within the limit |
| LithiumA naturally occurring element found in some groundwater. | Not detectedAverageSystem-wide | None set | None detected |
| SodiumA naturally occurring salt component. | 23 mg/LAverageDrinking Water | None set | Detected — no federal limit |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| OdorA measure of detectable smell in the water. | 1.4AverageDrinking Water | 3MCL | Within the limit |
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 385AverageDrinking Water | 1600MCL | Within the limit |
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 226 mg/LAverageDrinking Water | 1000 mg/LMCL | Within the limit |
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.11AverageDrinking Water | 5MCL | Within the limit |
+By source (3)— Drinking Water, Entry Point to Distribution System Waterman, Entry Point to Distribution System NBR
| |||
| HardnessA measure of dissolved calcium and magnesium minerals. | 157 mg/LAverageDrinking Water | None set | Detected — no federal limit |
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 1–3.1 %Running annual avgSystem-wide | None set | Detected — no federal limit |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 0.61 mg/LRunning annual avgSystem-wide | 4 mg/LMRDL | 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. | 0Reported levelDistribution System | 0MCL | None detected |
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PFAS | Not detectedAverageSystem-wide | None set | None detected |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements. | Not detected pCi/LAverageSource Water North Bay Aqueduct | 5 pCi/LMCL | Within the limit |
People also ask about Fairfield, CA's water
+Is Fairfield, CA tap water safe to drink in 2024?
Every one of the 22 contaminants measured in Fairfield, CA's 2024 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 Fairfield, CA tap water?
22 contaminants were measured in Fairfield, CA's 2024 Consumer Confidence Report, spanning metals, physical & aggregate, and inorganic chemicals. 17 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 Fairfield, 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 Fairfield, 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.