Drinking water quality · 2024
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
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.
- Treatment technique violationHealth-based1 violation on record · most recent Oct 20241 open
- Maximum contaminant level exceededHealth-based1 violation on record · most recent May 1999resolved
- Reporting1 violation on record · most recent Oct 20241 open
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 58 ug/LRunning annual avgSystem-wide | None set | Within the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 18 ug/LRunning annual avgSystem-wide | None set | Within the limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.71 mg/LAverageDrinking Water | 4 mg/LMCL | Within the limit |
| ChlorideA naturally occurring salt compound. | 10 mg/LAverageDrinking Water | None set | Detected — no federal limit |
| SulfateA naturally occurring mineral from rock and soil. | 45 mg/LAverageDrinking Water | None set | Detected — no federal limit |
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chlorine Free | 0.61 mg/LRunning annual avgSystem-wide | 4 mg/LMCL | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| CopperA metal that enters water from corroding household plumbing. | 0.17 mg/L90th percentileAt the tap | 1.3 mg/LAction level | Within the limit |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | Not detected ug/L90th percentileAt the tap | None set | None detected |
| LithiumA naturally occurring element found in some groundwater. | Not detectedAverageSystem-wide | None set | None detected |
| AluminumA common element sometimes used as a treatment coagulant. | 72 ug/LAverageDrinking Water | None set | Detected — no federal limit |
| IronA naturally occurring metal common in groundwater. | 21 ug/LAverageDrinking Water | None set | Detected — no federal limit |
| ManganeseA naturally occurring metal from soil and rock. | 24 ug/LAverageDrinking Water | None set | Detected — no federal limit |
| SodiumA naturally occurring salt component. | 23 mg/LAverageDrinking Water | None set | Detected — no federal limit |
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals. | 0Reported levelDistribution System | None set | 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 |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| HardnessA measure of dissolved calcium and magnesium minerals. | 157 mg/LAverageDrinking Water | None set | Detected — no federal limit |
| OdorA measure of detectable smell in the water. | 1.4AverageDrinking Water | None set | Detected — no federal limit |
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 385AverageDrinking Water | None set | Detected — no federal limit |
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 1.4–3.1 %Running annual avgSystem-wide | None set | Detected — no federal limit |
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 226 mg/LAverageDrinking Water | None set | Detected — no federal limit |
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.11AverageDrinking Water | 5MCL | Detected — no federal limit |
+By source (3)— Entry Point to Distribution System Waterman, Entry Point to Distribution System NBR, Drinking Water
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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. 5 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.