Drinking water quality · 2024
· Verified
What's in Vallejo, CA tap water
22 contaminants were measured in the Vallejo, CA water system's 2024 annual report. Each is shown below against its federal limit — 2 sit at or above that limit.
- Reporting year
- 2024
- Contaminants measured
- 22
- Over federal limit
- 2
- Approaching the limit
- 0
- Worst contaminant
- Specific Conductance
- Service area
- CA
Where your water comes from · EPA SDWIS
Vallejo, CA's drinking water comes from surface water, drawn from 7 sources.
Source
- FLEMING HILL WTP - RAW
- LAKE BARRYESSA - MONTICELLO - RAW
- NORTH BAY AQUEDUCT - RAW AT CORDELIA
- NORTH BAY AQUEDUCT RAW AT BARKER SLOUGH
- + 3 more
Treatment
- FLEMING HILL WTP - TREATED
Distribution
Historical readings · EPA Six-Year Review (2012–2019)
2 contaminants historically over EPA limits in Vallejo, 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) |
|---|---|---|---|
TTHM worst: 2019 | 0.0914 mg/L 1.1× | 0.08 mg/L | '19 |
CHROMIUM worst: 2016 | 0.103 mg/L 1.0× 10.3× the national p90 | 0.1 mg/L | '13'16'18'19 |
DEHP worst: 2017 | 0.0038 mg/L within | 0.006 mg/L | '17 |
HAA5 worst: 2019 | 0.0311 mg/L within | 0.06 mg/L | '19 |
ARSENIC worst: 2016 | 0.00468 mg/L within below national p90 | 0.01 mg/L | '12'13'14'15'16'17'18'19 |
CADMIUM worst: 2019 | 0.0023 mg/L within near national p90 | 0.005 mg/L | '13'19 |
BROMATE worst: 2015 | 0.0027 mg/L within | 0.01 mg/L | '14'15'16 |
FLUORIDE worst: 2014 | 0.96 mg/L within | 4 mg/L | '12'13'14'15'16'17'18'19 |
TCE worst: 2013 | 0.00097 mg/L within | 0.005 mg/L | '13 |
NITRATE worst: 2012 | 1.53 mg/L within | 10 mg/L | '12'13'14 |
URANIUM worst: 2018 | 0.00283 ug/L within below national p90 | 30 ug/L | '14'15'16'18 |
COPPER worst: 2013 | 0.055 mg/L below national p90 | — | '13 |
LEAD worst: 2014 | 0.0064 mg/L | — | '14'16'18'19 |
DBAA worst: 2019 | 0.0015 mg/L | — | '19 |
DCAA worst: 2019 | 0.0183 mg/L | — | '19 |
MCAA worst: 2019 | 0.003 mg/L | — | '19 |
TCAA worst: 2019 | 0.0113 mg/L | — | '19 |
BROMODICHLOROMETHANE worst: 2019 | 0.0139 mg/L | — | '19 |
CHLOROFORM worst: 2019 | 0.0731 mg/L | — | '19 |
DIBROMOCHLOROMETHANE worst: 2019 | 0.00515 mg/L | — | '19 |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 427AverageLakes Service Area | 1MCL | At or above the limit |
+By source (2)— Lakes Service Area, Vallejo Service Area
| |||
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 228 mg/LAverageLakes Service Area | 1 mg/LMCL | At or above the limit |
+By source (2)— Vallejo Service Area, Lakes Service Area
| |||
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.12 NTUAverageLakes Service Area | 5 NTUMCL | Within the limit |
+By source (2)— Vallejo Service Area, Lakes Service Area
| |||
| ColorA measure of visible tint in the water. | Not detectedAverageVallejo Service Area | 15MCL | Within the limit |
+By source (2)— Vallejo Service Area, Lakes Service Area
| |||
| HardnessA measure of dissolved calcium and magnesium minerals. | 155 mg/LAverageVallejo Service Area | None set | Detected — no federal limit |
+By source (2)— Vallejo Service Area, Lakes Service Area
| |||
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 1 %AverageVallejo Service Area | None set | Detected — no federal limit |
+By source (2)— Vallejo Service Area, Lakes Service Area
| |||
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| AluminumA common element sometimes used as a treatment coagulant. | 87 ug/LAverageVallejo Service Area | 200 ug/LMCL | Within the limit |
+By source (2)— Vallejo Service Area, Lakes Service Area
| |||
| Chromium, TotalTotal chromium — the sum of all chromium forms, from natural deposits and industrial discharge. | 0.25 ug/LAverageVallejo Service Area | 10 ug/LMCL | Within the limit |
+By source (2)— Vallejo Service Area, Lakes Service Area
| |||
| LithiumA naturally occurring element found in some groundwater. | Not detected ug/LAverageLakes Service Area | None set | None detected |
+By source (2)— Lakes Service Area, Vallejo Service Area
| |||
| SodiumA naturally occurring salt component. | 41 mg/LAverageLakes Service Area | None set | Detected — no federal limit |
+By source (2)— Lakes Service Area, Vallejo Service Area
| |||
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 1.02 mg/LAverageVallejo Service Area | 4 mg/LMCL | Within the limit |
+By source (2)— Vallejo Service Area, Lakes Service Area
| |||
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorideA naturally occurring salt compound. | 50 mg/LAverageLakes Service Area | 500 mg/LMCL | Within the limit |
+By source (2)— Lakes Service Area, Vallejo Service Area
| |||
| SulfateA naturally occurring mineral from rock and soil. | 45 mg/LAverageVallejo Service Area | 500 mg/LMCL | Within the limit |
+By source (2)— Vallejo Service Area, Lakes Service Area
| |||
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals. | 0RangeVallejo Service Area | 0MCL | None detected |
+By source (2)— Vallejo Service Area, Lakes Service Area
| |||
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PFAS | Not detected ug/LAverageLakes Service Area | None set | None detected |
+By source (4)— Lakes Service Area, Vallejo Service Area, Lakes Service Area +1 more
| |||
People also ask about Vallejo, CA's water
+Is Vallejo, CA tap water safe to drink in 2024?
The 2024 Consumer Confidence Report for the Vallejo, CA water utility lists 2 contaminants at or above the federal limit: Specific Conductance and Total Dissolved Solids. 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 Vallejo, CA tap water?
22 contaminants were measured in Vallejo, 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.
+Which contaminants exceed federal limits in Vallejo, CA tap water?
2 contaminants in Vallejo, CA's 2024 report sit at or above the federal limit: Specific Conductance (427.0× the limit); Total Dissolved Solids (228.0× 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 Vallejo, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2024 report is Specific Conductance, at 427.0× 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 Vallejo, 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 Vallejo, 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.