Drinking water quality · 2025
· Verified
What's in City of Martinez, CA tap water
96 contaminants were measured in the City of Martinez, CA water system's 2025 annual report. Each is shown below against its federal limit — 3 sit at or above that limit.
- Reporting year
- 2025
- Contaminants measured
- 96
- Over federal limit
- 3
- Approaching the limit
- 1
- Worst contaminant
- Odor
- Service area
- CA
6.7× the limit
state-level CCR
At or above the federal limit
Approaching the limit (≥ 80%)
Where your water comes from · EPA SDWIS
City of Martinez, CA buys its drinking water from CONTRA COSTA WATER DISTRICT.
Source
0sources
Treatment
1treatment plant
- MARTINEZ WTP
Distribution
0storage units
Also buys water from CONTRA COSTA WATER DISTRICT.
Source: EPA SDWIS facilities inventory. Methodology.
Historical readings · EPA Six-Year Review (2012–2019)
3 contaminants historically over EPA limits in City of Martinez, 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) |
|---|---|---|---|
NITRATE NITRITE worst: 2014 | 440 mg/L 44.0× | 10 mg/L | '14'17'18'19 |
GROSS BETA worst: 2014 | 41 mrem/yr 10.3× | 4 mrem/yr | '14'16'19 |
BROMATE worst: 2014 | 0.018 mg/L 1.8× | 0.01 mg/L | '12'13'14'15'16'17'18'19 |
DICHLOROMETHANE worst: 2017 | 0.0034 mg/L within | 0.005 mg/L | '17 |
ARSENIC worst: 2013 | 0.0058 mg/L within below national p90 | 0.01 mg/L | '12'13'16'17'18'19 |
NITRATE worst: 2012 | 4.86 mg/L within | 10 mg/L | '12'13'15'17'18'19 |
CADMIUM worst: 2017 | 0.0016 mg/L within near national p90 | 0.005 mg/L | '17 |
CHROMIUM worst: 2012 | 0.03 mg/L within 3.0× the national p90 | 0.1 mg/L | '12'19 |
FLUORIDE worst: 2012 | 0.91 mg/L within | 4 mg/L | '12'13'14'15'16'17'18'19 |
SELENIUM worst: 2015 | 0.0076 mg/L within | 0.05 mg/L | '15 |
BARIUM worst: 2012 | 0.16 mg/L within near national p90 | 2 mg/L | '12'16'18'19 |
DEHP worst: 2019 | 0.00039 mg/L within | 0.006 mg/L | '19 |
TTHM worst: 2012 | 0.0039 mg/L within | 0.08 mg/L | '12'13 |
RADIUM 226 228 worst: 2019 | 0.16 pCi/L within below national p90 | 5 pCi/L | '19 |
ASBESTOS worst: 2013 | 0.2 MFL within below national p90 | 7 MFL | '13 |
CYANIDE worst: 2019 | 0.0016 mg/L within below national p90 | 0.2 mg/L | '18'19 |
DEHA worst: 2019 | 0.00021 mg/L within | 0.4 mg/L | '19 |
COPPER worst: 2019 | 0.32 mg/L below national p90 | — | '19 |
LEAD worst: 2019 | 0.0028 mg/L | — | '19 |
BROMOFORM worst: 2012 | 0.0028 mg/L | — | '12'13 |
DIBROMOCHLOROMETHANE worst: 2012 | 0.0011 mg/L | — | '12 |
PWSID CA0710006 · Source: EPA Six-Year Review 4 (2012–2019). Values are the highest detection in each calendar year; non-detect years are omitted. Year tags above show every year with a detection.
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| OdorA measure of detectable smell in the water. | 20 TONAverageSource water | 3 TONMCL | At or above the limit |
| TurbidityA measure of cloudiness from suspended particles in the water. | 27 NTUAverageSource water | 5 NTUMCL | At or above the limit |
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 420 UMHO/CMAverageEntry point | 1600 UMHO/CMMCL | Within the limit |
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 225 MG/LAverageEntry point | 1000 MG/LMCL | Within the limit |
| ColorA measure of visible tint in the water. | Not detected UNITSHighest single sampleEntry point | 15 UNITSMCL | None detected |
| AlkalinityA measure of the water's capacity to neutralize acids. | 52.79999999999999 MG/LAverageSource water | None set | Detected — no federal limit |
| HardnessA measure of dissolved calcium and magnesium minerals. | 80.5 MG/LAverageEntry point | None set | Detected — no federal limit |
| pHA measure of how acidic or basic the water is. | 8.3 PHAverageEntry point | None set | Detected — no federal limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| IronA naturally occurring metal common in groundwater. | 1400 UG/LAverageSource water | 300 UG/LMCL | At or above the limit |
| AluminumA common element sometimes used as a treatment coagulant. | 860 UG/LAverageSource water | 1000 UG/LMCL | Approaching the limit |
| ManganeseA naturally occurring metal from soil and rock. | 33 UG/LAverageSource water | 50 UG/LMCL | Within the limit |
| NickelA metal from natural deposits and industrial discharge. | 1.2999999999999998 UG/LAverageEntry point | 100 UG/LMCL | Within the limit |
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 0.055999999999999994 UG/LAverageEntry point | 10 UG/LMCL | Within the limit |
| Antimony | Not detected UG/LHighest single sampleSource water | 6 UG/LMCL | None detected |
| Beryllium | Not detected UG/LHighest single sampleSource water | 4 UG/LMCL | None detected |
| MercuryA toxic metal from erosion of natural deposits and industrial runoff. | Not detected UG/LHighest single sampleEntry point | 2 UG/LMCL | None detected |
| Thallium | Not detected UG/LHighest single sampleSource water | 2 UG/LMCL | None detected |
| ZincA naturally occurring metal that can also enter water from corroding pipes. | Not detected UG/LHighest single sampleEntry point | 5000 UG/LMCL | None detected |
| CalciumA naturally occurring mineral that contributes to water hardness. | 8.333333333333334 MG/LAverageSource water | None set | Detected — no federal limit |
| MagnesiumA naturally occurring mineral that contributes to water hardness. | 11 MG/LAverageSource water | None set | Detected — no federal limit |
| PotassiumA naturally occurring mineral from rock and soil. | 3 MG/LAverageSource water | None set | Detected — no federal limit |
| SodiumA naturally occurring salt component. | 50.5 MG/LAverageEntry point | None set | Detected — no federal limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorideA naturally occurring salt compound. | 57.5 MG/LAverageEntry point | 500 MG/LMCL | Within the limit |
| SulfateA naturally occurring mineral from rock and soil. | 40 MG/LAverageEntry point | 500 MG/LMCL | Within the limit |
| Ammonia | Not detected MG/LHighest single sampleSource water | None set | None detected |
| NitriteA compound from fertilizer runoff, sewage, and erosion of natural deposits. | Not detected MG/LHighest single sampleEntry point | 1 MG/LMCL | None detected |
| BromideA naturally occurring salt found in source water. | 0.15 MG/LAverageSource water | None set | Detected — no federal limit |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 4.0200000000000005 UG/LAverageDistribution | 60 UG/LMCL | Within the limit |
| PerchlorateA chemical used in rocket fuel and fireworks that can also form during disinfection. | Not detected UG/LHighest single sampleSource water | 6 UG/LMCL | None detected |
| BromodichloromethaneA trihalomethane disinfection byproduct. | 7.635 UG/LAverageDistribution | None set | Detected — no federal limit |
| ChloroformA trihalomethane formed when chlorine reacts with organic matter in water. | 10.16 UG/LAverageDistribution | None set | Detected — no federal limit |
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Carbofuran | Not detected UG/LHighest single sampleSource water | 18 UG/LMCL | None detected |
| Carbon Tetrachloride | Not detected UG/LHighest single sampleSource water | 0.5 UG/LMCL | None detected |
| Chlordane | Not detected UG/LHighest single sampleOther | 0.1 UG/LMCL | None detected |
| Chlorobenzene | Not detected UG/LHighest single sampleSource water | 70 UG/LMCL | None detected |
| Cis Dichloroethylene 12 | Not detected UG/LHighest single sampleSource water | 6 UG/LMCL | None detected |
| Dichloroethane 12 | Not detected UG/LHighest single sampleSource water | 0.5 UG/LMCL | None detected |
| Dichloroethylene 11 | Not detected UG/LHighest single sampleSource water | 6 UG/LMCL | None detected |
| Dichloropropane 12 | Not detected UG/LHighest single sampleSource water | 5 UG/LMCL | None detected |
| Dinoseb | Not detected UG/LHighest single sampleSource water | 7 UG/LMCL | None detected |
| Diquat | Not detected UG/LHighest single sampleSource water | 20 UG/LMCL | None detected |
| Edb | Not detected UG/LHighest single sampleSource water | 0.05 UG/LMCL | None detected |
| Endothall | Not detected UG/LHighest single sampleSource water | 100 UG/LMCL | None detected |
| Endrin | Not detected UG/LHighest single sampleSource water | 2 UG/LMCL | None detected |
| Glyphosate | Not detected UG/LHighest single sampleSource water | 700 UG/LMCL | None detected |
| Heptachlor | Not detected UG/LHighest single sampleSource water | 0.01 UG/LMCL | None detected |
| Heptachlor Epoxide | Not detected UG/LHighest single sampleOther | 0.01 UG/LMCL | None detected |
| Hexachlorobenzene | Not detected UG/LHighest single sampleSource water | 1 UG/LMCL | None detected |
| Hexachlorocyclopentadiene | Not detected UG/LHighest single sampleSource water | 50 UG/LMCL | None detected |
| Mbaa | Not detected UG/LHighest single sampleDistribution | None set | None detected |
| Mcaa | Not detected UG/LHighest single sampleDistribution | None set | None detected |
| Methoxychlor | Not detected UG/LHighest single sampleOther | 30 UG/LMCL | None detected |
| O Dichlorobenzene | Not detected UG/LHighest single sampleSource water | 600 UG/LMCL | None detected |
| Oxamyl | Not detected UG/LHighest single sampleSource water | 50 UG/LMCL | None detected |
| P Dichlorobenzene | Not detected UG/LHighest single sampleSource water | 5 UG/LMCL | None detected |
| Pcb Total | Not detected UG/LHighest single sampleSource water | 0.5 UG/LMCL | None detected |
| Pce | Not detected UG/LHighest single sampleSource water | 5 UG/LMCL | None detected |
| Pentachlorophenol | Not detected UG/LHighest single sampleSource water | 1 UG/LMCL | None detected |
| Picloram | Not detected UG/LHighest single sampleSource water | 500 UG/LMCL | None detected |
| Styrene | Not detected UG/LHighest single sampleSource water | 100 UG/LMCL | None detected |
| Tce | Not detected UG/LHighest single sampleSource water | 5 UG/LMCL | None detected |
| Toxaphene | Not detected UG/LHighest single sampleSource water | 3 UG/LMCL | None detected |
| Trans Dichloroethylene 12 | Not detected UG/LHighest single sampleSource water | 10 UG/LMCL | None detected |
| Trichlorobenzene 124 | Not detected UG/LHighest single sampleSource water | 5 UG/LMCL | None detected |
| Trichloroethane 111 | Not detected UG/LHighest single sampleSource water | 200 UG/LMCL | None detected |
| Trichloroethane 112 | Not detected UG/LHighest single sampleSource water | 5 UG/LMCL | None detected |
| Twofourd | Not detected UG/LHighest single sampleSource water | 70 UG/LMCL | None detected |
| Vinyl Chloride | Not detected UG/LHighest single sampleSource water | 0.5 UG/LMCL | None detected |
| Dbaa | 1.2550000000000001 UG/LAverageDistribution | None set | Detected — no federal limit |
| Dcaa | 2.435 UG/LAverageDistribution | None set | Detected — no federal limit |
| Tcaa | 1.06 UG/LAverageDistribution | None set | Detected — no federal limit |
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| AtrazineA widely used agricultural herbicide that reaches water through runoff. | Not detected UG/LHighest single sampleSource water | 1 UG/LMCL | None detected |
| Benzene | Not detected UG/LHighest single sampleSource water | 1 UG/LMCL | None detected |
| Benzo(a)pyrene | Not detected UG/LHighest single sampleSource water | 0.2 UG/LMCL | None detected |
| Dalapon | Not detected UG/LHighest single sampleSource water | 200 UG/LMCL | None detected |
| Ethylbenzene | Not detected UG/LHighest single sampleSource water | 300 UG/LMCL | None detected |
| Simazine | Not detected UG/LHighest single sampleSource water | 4 UG/LMCL | None detected |
| Toluene | Not detected UG/LHighest single sampleSource water | 150 UG/LMCL | None detected |
| XylenesA group of industrial solvents found in gasoline and paint. | Not detected UG/LHighest single sampleOther | 1750 UG/LMCL | None detected |
Source: City of Martinez, CA's 2025 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 City of Martinez, CA's water
+Is City of Martinez, CA tap water safe to drink in 2025?
The 2025 Consumer Confidence Report for the City of Martinez, CA water utility lists 3 contaminants at or above the federal limit: Odor, Turbidity, and Iron. 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 City of Martinez, CA tap water?
96 contaminants were measured in City of Martinez, CA's 2025 Consumer Confidence Report, spanning other, metals, and vocs & pesticides. 77 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 City of Martinez, CA tap water?
3 contaminants in City of Martinez, CA's 2025 report sit at or above the federal limit: Odor (6.7× the limit); Turbidity (5.4× the limit); Iron (4.7× 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 City of Martinez, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2025 report is Odor, at 6.7× the federal threshold. It belongs to the physical & aggregate family of contaminants.
+Are any contaminants in City of Martinez, CA tap water approaching the federal limit?
One contaminant is between 80% and 100% of the federal limit in this report: Aluminum. Approaching means measured but not in violation — a margin that can close quickly if conditions change.
+Where does the data on this page come from?
Every value is transcribed from City of Martinez, CA's 2025 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 City of Martinez, 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 2025 report; a new report will replace it once the utility publishes its next annual update.
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