Tap WaterIndex

← California

Tap water quality report

Martinez, CA

EPA monitoring detected 22 contaminants across the 2 water suppliers serving Martinez. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

2
water suppliers
31,478
people served
22
contaminants found
California rankings Lead in California PFAS in California

What was found in Martinez's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate-Nitrite
920000 µg/L 9200%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
Main supplier: CITY OF MARTINEZ · 30,997 people · 2019
1/2 SYR4
Nitrate
4286.09 µg/L 43%
of the EPA limit 10000 µg/L
Main supplier: CITY OF MARTINEZ · 30,997 people · 2019
2/2 SYR4
Fluoride
795.5 µg/L 20%
of the EPA limit 4000 µg/L
Main supplier: CITY OF MARTINEZ · 30,997 people · 2019
2/2 SYR4
Copper
289.2 µg/L 22%
of the EPA limit 1300 µg/L
Main supplier: CITY OF MARTINEZ · 30,997 people · 2019
1/2 SYR4
Barium
158 µg/L 7.9%
of the EPA limit 2000 µg/L
Main supplier: CITY OF MARTINEZ · 30,997 people · 2019
Highest in the city: 189 µg/L — WILLOW MOBILE HOME PARK · 481 people · 2018
2/2 SYR4
Gross Beta Particle Activity
37.46 pCi/L
No EPA limit set
Main supplier: CITY OF MARTINEZ · 30,997 people · 2019
1/2 SYR4
Chromium
29 µg/L 29%
of the EPA limit 100 µg/L
Main supplier: CITY OF MARTINEZ · 30,997 people · 2019
1/2 SYR4
Bromate
9.44 µg/L 94%
of the EPA limit 10 µg/L
Main supplier: CITY OF MARTINEZ · 30,997 people · 2019
1/2 SYR4
Selenium
7.6 µg/L 15%
of the EPA limit 50 µg/L
Main supplier: CITY OF MARTINEZ · 30,997 people · 2019
1/2 SYR4
Arsenic
4.655 µg/L 47%
of the EPA limit 10 µg/L
Main supplier: CITY OF MARTINEZ · 30,997 people · 2019
2/2 SYR4
TTHM
3.845 µg/L 4.8%
of the EPA limit 80 µg/L
Main supplier: CITY OF MARTINEZ · 30,997 people · 2017
1/2 SYR4
Dichloromethane
3.12 µg/L 62%
of the EPA limit 5 µg/L
Main supplier: CITY OF MARTINEZ · 30,997 people · 2019
1/2 SYR4
Lead
2.73 µg/L 18%
of the EPA limit 15 µg/L
Main supplier: CITY OF MARTINEZ · 30,997 people · 2019
1/2 SYR4
Bromoform
2.725 µg/L
No EPA limit set
Main supplier: CITY OF MARTINEZ · 30,997 people · 2017
1/2 SYR4
Cadmium
1.6 µg/L 32%
of the EPA limit 5 µg/L
Main supplier: CITY OF MARTINEZ · 30,997 people · 2019
1/2 SYR4
Cyanide
1.575 µg/L 0.8%
of the EPA limit 200 µg/L
Main supplier: CITY OF MARTINEZ · 30,997 people · 2019
1/2 SYR4
Dibromochloromethane
1.1 µg/L
No EPA limit set
Main supplier: CITY OF MARTINEZ · 30,997 people · 2017
1/2 SYR4
Di(2-ethylhexyl) Phthalate
0.3845 µg/L 6.4%
of the EPA limit 6 µg/L
Main supplier: CITY OF MARTINEZ · 30,997 people · 2019
1/2 SYR4
Di(2-ethylhexyl) Adipate
0.2100 µg/L 0.1%
of the EPA limit 400 µg/L
Main supplier: CITY OF MARTINEZ · 30,997 people · 2019
1/2 SYR4
Asbestos
0.2000 MFL 2.9%
of the EPA limit 7 MFL
Main supplier: CITY OF MARTINEZ · 30,997 people · 2017
1/2 SYR4
Combined Radium (-226 And -228)
0.1600 pCi/L 3.2%
of the EPA limit 5 pCi/L
Main supplier: CITY OF MARTINEZ · 30,997 people · 2019
1/2 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: CITY OF MARTINEZ · 30,997 people · 2025
Highest in the city: 0.0100 mg/L — WILLOW MOBILE HOME PARK · 481 people · 2021
2/2 LCR
Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Martinez

SupplierPopulation served
CITY OF MARTINEZ 30,997
WILLOW MOBILE HOME PARK 481

Frequently asked questions about Martinez tap water

Is Martinez tap water safe to drink?

EPA testing detected 22 contaminants in the water serving Martinez. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Martinez?

2 public water suppliers report drinking-water monitoring for Martinez, California to the EPA. Each is listed above with its population served.

What contaminants are in Martinez's water?

The contaminants EPA monitoring detected in Martinez include Nitrate-Nitrite, Nitrate, Fluoride, Copper, Barium. The full list, with the level at the main supplier and the data source, is in the table above.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.