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Tap water quality report

Corte Madera, CA

EPA monitoring detected 18 contaminants across the 1 water supplier serving Corte Madera. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

1
water supplier
186,895
people served
18
contaminants found
California rankings Lead in California PFAS in California

What was found in Corte Madera's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate-Nitrite
700000 µg/L 7000%
of the EPA limit, in the worst sample — 10000 µg/L
 1/1 SYR4
Fluoride
1020 µg/L 26%
of the EPA limit 4000 µg/L
 1/1 SYR4
Nitrate
700.6 µg/L 7%
of the EPA limit 10000 µg/L
 1/1 SYR4
Nitrite
400 µg/L 40%
of the EPA limit 1000 µg/L
 1/1 SYR4
Copper
121 µg/L 9.3%
of the EPA limit 1300 µg/L
 1/1 SYR4
Barium
100 µg/L 5%
of the EPA limit 2000 µg/L
 1/1 SYR4
Total Haloacetic Acids (HAA5)
99.2 µg/L 165%
of the EPA limit, in the worst sample — 60 µg/L
 1/1 SYR4
TTHM
86.2 µg/L 108%
of the EPA limit, in the worst sample — 80 µg/L
 1/1 SYR4
Chloroform
68.4 µg/L
No EPA limit set
 1/1 SYR4
Dichloroacetic Acid
57.4 µg/L
No EPA limit set
 1/1 SYR4
Trichloroacetic Acid
40.6 µg/L
No EPA limit set
 1/1 SYR4
Bromodichloromethane
16.2 µg/L
No EPA limit set
 1/1 SYR4
Dibromochloromethane
10.8 µg/L
No EPA limit set
 1/1 SYR4
Chromium
10 µg/L 10%
of the EPA limit 100 µg/L
 1/1 SYR4
Dibromoacetic Acid
6.4 µg/L
No EPA limit set
 1/1 SYR4
Monochloroacetic Acid
3.7 µg/L
No EPA limit set
 1/1 SYR4
Bromoform
2.9 µg/L
No EPA limit set
 1/1 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 1/1 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 single worst sample on record — 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 Corte Madera

SupplierPopulation served
MARIN MUNICIPAL WATER DISTRICT 186,895

Frequently asked questions about Corte Madera tap water

Is Corte Madera tap water safe to drink?

EPA testing detected 18 contaminants in the water serving Corte Madera. 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 Corte Madera?

1 public water supplier report drinking-water monitoring for Corte Madera, California to the EPA. Each is listed above with its population served.

What contaminants are in Corte Madera's water?

The contaminants EPA monitoring detected in Corte Madera include Nitrate-Nitrite, Fluoride, Nitrate, Nitrite, Copper. The full list, with the highest level found 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.