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Tap water quality report

Lake Forest, CA

EPA monitoring detected 12 contaminants across the 1 water supplier serving Lake Forest. 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
51,800
people served
12
contaminants found
California rankings Lead in California PFAS in California

What was found in Lake Forest'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
68.51 µg/L 86%
of the EPA limit 80 µg/L
Main supplier: EL TORO WATER DISTRICT · 51,800 people · 2019
1/1 SYR4
Lithium
45 µg/L
No EPA limit set
Main supplier: EL TORO WATER DISTRICT · 51,800 people · 2024
1/1 UCMR-5
Total Haloacetic Acids (HAA5)
26.225 µg/L 44%
of the EPA limit 60 µg/L
Main supplier: EL TORO WATER DISTRICT · 51,800 people · 2019
1/1 SYR4
Dibromochloromethane
23.91 µg/L
No EPA limit set
Main supplier: EL TORO WATER DISTRICT · 51,800 people · 2019
1/1 SYR4
Chloroform
23.31 µg/L
No EPA limit set
Main supplier: EL TORO WATER DISTRICT · 51,800 people · 2019
1/1 SYR4
Bromodichloromethane
22.42 µg/L
No EPA limit set
Main supplier: EL TORO WATER DISTRICT · 51,800 people · 2019
1/1 SYR4
Dichloroacetic Acid
13.58 µg/L
No EPA limit set
Main supplier: EL TORO WATER DISTRICT · 51,800 people · 2019
1/1 SYR4
Trichloroacetic Acid
12.5 µg/L
No EPA limit set
Main supplier: EL TORO WATER DISTRICT · 51,800 people · 2019
1/1 SYR4
Bromoform
8.951 µg/L
No EPA limit set
Main supplier: EL TORO WATER DISTRICT · 51,800 people · 2019
1/1 SYR4
Dibromoacetic Acid
7.585 µg/L
No EPA limit set
Main supplier: EL TORO WATER DISTRICT · 51,800 people · 2019
1/1 SYR4
Pfba
0.0067 µg/L
No EPA limit set
Main supplier: EL TORO WATER DISTRICT · 51,800 people · 2024
1/1 UCMR-5
Lead
0.00080 mg/L 5.3%
of the EPA limit 0.0150 mg/L
Main supplier: EL TORO WATER DISTRICT · 51,800 people · 2023
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 Lake Forest

SupplierPopulation served
EL TORO WATER DISTRICT 51,800

Frequently asked questions about Lake Forest tap water

Is Lake Forest tap water safe to drink?

EPA testing detected 12 contaminants in the water serving Lake Forest. 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 Lake Forest?

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

What contaminants are in Lake Forest's water?

The contaminants EPA monitoring detected in Lake Forest include TTHM, Lithium, Total Haloacetic Acids (HAA5), Dibromochloromethane, Chloroform. 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.