Drinking water quality · 2024
What's in Vacaville, CA tap water
34 contaminants were measured in the Vacaville, CA water system's 2024 annual report. Each is shown below against its federal limit.
- Reporting year
- 2024
- Contaminants measured
- 34
- Over federal limit
- 0
- Approaching the limit
- 0
- Service area
- CA
state-level CCR
PFAS — EPA UCMR5 (2023–2025)
2 PFAS compounds above EPA limits in Vacaville, CA
The EPA finalized the first-ever federal drinking-water limits for six PFAS compounds in April 2024. These numbers come straight from EPA's UCMR5 lab dataset — every U.S. system serving more than 3,300 people tested every PFAS sample at an entry point to its distribution system. PFAS not listed below were either tested and not detected, or not yet sampled.
PFOS (Perfluorooctane sulfonic acid)
● Over EPA limit (2.5×)Measured 10 ng/LEPA limit 4 ng/LSample year 2024Samples 2 detect / 11
PFOA (Perfluorooctanoic acid)
● Over EPA limit (1.3×)Measured 5.1 ng/LEPA limit 4 ng/LSample year 2024Samples 1 detect / 11
PFHxS (Perfluorohexane sulfonic acid)
● Approaching limit (92%)Measured 9.2 ng/LEPA limit 10 ng/LSample year 2024Samples 3 detect / 11
PFBS
● Detected (no federal limit)Measured 3.7 ng/LSample year 2024Samples 2 detect / 11
PWSID CA4810008 · Source: EPA UCMR5. Limits per EPA's April 2024 PFAS National Primary Drinking Water Regulation. PFAS values reported in nanograms per liter (ng/L) — note that 1 ng/L = 1 part per trillion.
Where your water comes from · EPA SDWIS
Vacaville, CA's drinking water comes from ground water, drawn from 15 sources.
Source
15ground water
- WELL · 11
- DE MELLO WELL - STANDBY
- NBR WTP - NORTH BAY AQUEDUCT - RAW
- NBR WTP - PUTAH SOUTH CANAL - RAW
- + 1 more
Treatment
13treatment plants
- WELL 16 - TREATED
- WELL 03 - TREATED
- WELL 05 - TREATED
- + 10 more
Distribution
0storage units
Also buys water from CITY OF FAIRFIELD.
Source: EPA SDWIS facilities inventory. Methodology.
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.
No federal drinking-water violations on record for this system.
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 4.8 ug/LAverage2023-2024 Groundwater | None set | Within the limit |
+By source (3)— 2023-2024 Groundwater, Nbr, Vwtp
| |||
| Chromium, TotalTotal chromium — the sum of all chromium forms, from natural deposits and industrial discharge. | 19 ug/LAverage2023-2024 Groundwater | None set | Within the limit |
+By source (3)— 2023-2024 Groundwater, Nbr, Vwtp
| |||
| CopperA metal that enters water from corroding household plumbing. | 0.16 mg/L90th percentileAt the tap | 1.3 mg/LAction level | Within the limit |
| BariumA metal from erosion of natural deposits and industrial discharge. | 0.1 mg/LAverage2023-2024 Groundwater | 2 mg/LMCL | Within the limit |
+By source (3)— 2023-2024 Groundwater, Nbr, Vwtp
| |||
| SeleniumA trace element from natural deposits and industrial discharge. | 2.3 ug/LAverage2023-2024 Groundwater | None set | Within the limit |
+By source (3)— 2023-2024 Groundwater, Nbr, Vwtp
| |||
| 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 |
| AluminumA common element sometimes used as a treatment coagulant. | 0.04 mg/LAverageNbr | None set | Detected — no federal limit |
+By source (3)— Nbr, Vwtp, 2023-2024 Groundwater
| |||
| BoronA naturally occurring element from rock and soil. | 0.18 mg/LAverageVwtp | 1 mg/LNL | Detected — no federal limit |
+By source (3)— Vwtp, 2023 Groundwater, Nbr
| |||
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 14 ug/LAverage2023-2024 Groundwater | None set | Detected — no federal limit |
+By source (2)— 2023-2024 Groundwater, Vwtp
| |||
| IronA naturally occurring metal common in groundwater. | 0.17 mg/LAverageNbr | None set | Detected — no federal limit |
+By source (3)— Nbr, 2023 Groundwater, Vwtp
| |||
| LithiumA naturally occurring element found in some groundwater. | 28 ug/LAverageSource water | None set | Detected — no federal limit |
+By source (2)— Health Effects, Distribution System
| |||
| ManganeseA naturally occurring metal from soil and rock. | 13 ug/LAverageNbr | None set | Detected — no federal limit |
+By source (3)— Nbr, Vwtp, 2023 Groundwater
| |||
| SodiumA naturally occurring salt component. | 57 mg/LAverage2023 Groundwater | None set | Detected — no federal limit |
+By source (3)— 2023 Groundwater, Nbr, Vwtp
| |||
| Vanadium | 3.1 ug/LAverageNbr | 50 ug/LNL | Detected — no federal limit |
+By source (2)— Nbr, Vwtp
| |||
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 34 ug/LAverageSystem-wide | None set | Within the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 16 ug/LAverageSystem-wide | None set | Within the limit |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 1.11 mg/LAverageSystem-wide | 4 mg/LMCL | Within the limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 3.1 pCi/LAverage2020 Groundwater | 15 pCi/LMCL | Within the limit |
+By source (2)— 2020 Groundwater, Vwtp
| |||
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.75 mg/LAverage2023-2024 Groundwater | 4 mg/LMCL | Within the limit |
+By source (3)— 2023-2024 Groundwater, Nbr, Vwtp
| |||
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 1.4 mg/LAverage2023-2024 Groundwater | 10 mg/LMCL | Within the limit |
+By source (3)— 2023-2024 Groundwater, Nbr, Vwtp
| |||
| ChlorideA naturally occurring salt compound. | 23 mg/LAverage2023 Groundwater | None set | Detected — no federal limit |
+By source (3)— 2023 Groundwater, Vwtp, Nbr
| |||
| SulfateA naturally occurring mineral from rock and soil. | 42 mg/LAverageNbr | None set | Detected — no federal limit |
+By source (3)— 2023 Groundwater, Nbr, Vwtp
| |||
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals. | 0Highest single sampleNo. Of Detections | 0MCLG | None detected |
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 0 %Highest single sampleNo. Of Detections | None set | None detected |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| HardnessA measure of dissolved calcium and magnesium minerals. | 177 mg/LAverage2023 Groundwater | None set | Detected — no federal limit |
+By source (3)— 2023 Groundwater, Nbr, Vwtp
| |||
| OdorA measure of detectable smell in the water. | 1.4AverageNbr | None set | Detected — no federal limit |
+By source (3)— Nbr, 2023 Groundwater, Vwtp
| |||
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 589Average2023 Groundwater | None set | Detected — no federal limit |
+By source (3)— 2023 Groundwater, Nbr, Vwtp
| |||
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 2.1 mg/LAverageSystem-wide | None set | Detected — no federal limit |
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 373 mg/LAverage2023 Groundwater | None set | Detected — no federal limit |
+By source (3)— 2023 Groundwater, Nbr, Vwtp
| |||
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.51Average2023 Groundwater | None set | Detected — no federal limit |
+By source (3)— 2023 Groundwater, Vwtp, Nbr
| |||
Source: Vacaville, CA's 2024 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 Vacaville, CA's water
+Is Vacaville, CA tap water safe to drink in 2024?
Every one of the 34 contaminants measured in Vacaville, 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 Vacaville, CA tap water?
34 contaminants were measured in Vacaville, CA's 2024 Consumer Confidence Report, spanning metals, physical & aggregate, and inorganic chemicals. 9 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 Vacaville, 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 Vacaville, 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.
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