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Tap water quality report

Menlo Park, CA

EPA monitoring detected 9 contaminants across the 1 water supplier serving Menlo Park. 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.

1
water supplier
22,362
people served
9
contaminants found
California rankings Lead in California PFAS in California

What was found in Menlo Park'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
TTHM
61.355 µg/L 77%
of the EPA limit 80 µg/L
Main supplier: MENLO PARK MUNICIPAL WATER · 22,362 people · 2019
1/1 SYR4
Chloroform
59.8 µg/L
No EPA limit set
Main supplier: MENLO PARK MUNICIPAL WATER · 22,362 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
44.279999999999994 µg/L 74%
of the EPA limit 60 µg/L
Main supplier: MENLO PARK MUNICIPAL WATER · 22,362 people · 2019
1/1 SYR4
Dichloroacetic Acid
26.424999999999997 µg/L
No EPA limit set
Main supplier: MENLO PARK MUNICIPAL WATER · 22,362 people · 2019
1/1 SYR4
Trichloroacetic Acid
22.27499999999999 µg/L
No EPA limit set
Main supplier: MENLO PARK MUNICIPAL WATER · 22,362 people · 2019
1/1 SYR4
Bromodichloromethane
4.70399999999999 µg/L
No EPA limit set
Main supplier: MENLO PARK MUNICIPAL WATER · 22,362 people · 2019
1/1 SYR4
Monochloroacetic Acid
2.73 µg/L
No EPA limit set
Main supplier: MENLO PARK MUNICIPAL WATER · 22,362 people · 2019
1/1 SYR4
Dibromochloromethane
1.798 µg/L
No EPA limit set
Main supplier: MENLO PARK MUNICIPAL WATER · 22,362 people · 2019
1/1 SYR4
Lead
0.0031 mg/L 21%
of the EPA limit 0.0150 mg/L
Main supplier: MENLO PARK MUNICIPAL WATER · 22,362 people · 2024
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 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 Menlo Park

SupplierPopulation served
MENLO PARK MUNICIPAL WATER 22,362

Frequently asked questions about Menlo Park tap water

Is Menlo Park tap water safe to drink?

EPA testing detected 9 contaminants in the water serving Menlo Park. 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 Menlo Park?

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

What contaminants are in Menlo Park's water?

The contaminants EPA monitoring detected in Menlo Park include TTHM, Chloroform, Total Haloacetic Acids (HAA5), Dichloroacetic Acid, Trichloroacetic Acid. 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.