Drinking water quality · 2026
· Verified
What's in City of Martinez, CA tap water
45 contaminants were measured in the City of Martinez, CA water system's 2026 annual report. Each is shown below against its federal limit.
- Reporting year
- 2026
- Contaminants measured
- 45
- Over federal limit
- 0
- Approaching the limit
- 0
- Service area
- CA
Where your water comes from · EPA SDWIS
City of Martinez, CA buys its drinking water from CONTRA COSTA WATER DISTRICT.
Source
Treatment
- MARTINEZ WTP
Distribution
Also buys water from CONTRA COSTA WATER DISTRICT.
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 |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 390 UMHO/CMAverageEntry point | 1600 UMHO/CMMCL | Within the limit |
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 210 MG/LAverageEntry point | 1000 MG/LMCL | Within the limit |
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.35 NTUAverageEntry point | 5 NTUMCL | Within the limit |
| ColorA measure of visible tint in the water. | Not detected UNITSHighest single sampleEntry point | 15 UNITSMCL | None detected |
| OdorA measure of detectable smell in the water. | Not detected TONHighest single sampleEntry point | 3 TONMCL | None detected |
| AlkalinityA measure of the water's capacity to neutralize acids. | 45.666666666666664 MG/LAverageEntry point | None set | Detected — no federal limit |
| pHA measure of how acidic or basic the water is. | 8.6 PHAverageEntry point | None set | Detected — no federal limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorideA naturally occurring salt compound. | 46 MG/LAverageEntry point | 500 MG/LMCL | Within the limit |
| SulfateA naturally occurring mineral from rock and soil. | 43 MG/LAverageEntry point | 500 MG/LMCL | Within the limit |
| NitriteA compound from fertilizer runoff, sewage, and erosion of natural deposits. | Not detected MG/LHighest single sampleEntry point | 1 MG/LMCL | None detected |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 4 UG/LAverageDistribution | 60 UG/LMCL | Within the limit |
| BromodichloromethaneA trihalomethane disinfection byproduct. | 8.690000000000001 UG/LAverageDistribution | None set | Detected — no federal limit |
| ChloroformA trihalomethane formed when chlorine reacts with organic matter in water. | 14.02 UG/LAverageDistribution | None set | Detected — no federal limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 0.063 UG/LAverageEntry point | 10 UG/LMCL | Within the limit |
| AluminumA common element sometimes used as a treatment coagulant. | Not detected UG/LHighest single sampleEntry point | 1000 UG/LMCL | None detected |
| Antimony | Not detected UG/LHighest single sampleEntry point | 6 UG/LMCL | None detected |
| Beryllium | Not detected UG/LHighest single sampleEntry point | 4 UG/LMCL | None detected |
| IronA naturally occurring metal common in groundwater. | Not detected UG/LHighest single sampleEntry point | 300 UG/LMCL | None detected |
| ManganeseA naturally occurring metal from soil and rock. | Not detected UG/LHighest single sampleEntry point | 50 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 |
| NickelA metal from natural deposits and industrial discharge. | Not detected UG/LHighest single sampleEntry point | 100 UG/LMCL | None detected |
| Thallium | Not detected UG/LHighest single sampleEntry point | 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. | 9 MG/LAverageEntry point | None set | Detected — no federal limit |
| MagnesiumA naturally occurring mineral that contributes to water hardness. | 9.9 MG/LAverageEntry point | None set | Detected — no federal limit |
| PotassiumA naturally occurring mineral from rock and soil. | 2.7 MG/LAverageEntry point | None set | Detected — no federal limit |
| SodiumA naturally occurring salt component. | 48 MG/LAverageEntry point | None set | Detected — no federal limit |
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Mbaa | Not detected UG/LHighest single sampleDistribution | None set | None detected |
| Mcaa | Not detected UG/LHighest single sampleDistribution | None set | None detected |
| Tcaa | Not detected UG/LHighest single sampleDistribution | None set | None detected |
| Dbaa | 1.2 UG/LAverageDistribution | None set | Detected — no federal limit |
| Dcaa | 2.9 UG/LAverageDistribution | None set | Detected — no federal limit |
People also ask about City of Martinez, CA's water
+Is City of Martinez, CA tap water safe to drink in 2026?
Every one of the 45 contaminants measured in City of Martinez, CA's 2026 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 City of Martinez, CA tap water?
45 contaminants were measured in City of Martinez, CA's 2026 Consumer Confidence Report, spanning metals, physical & aggregate, and disinfection byproducts. 29 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 City of Martinez, CA's 2026 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 2026 report; a new report will replace it once the utility publishes its next annual update.