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Tap water quality report

Rancho Santa Fe, CA

EPA monitoring detected 26 contaminants across the 1 water supplier serving Rancho Santa Fe. 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
21,578
people served
26
contaminants found
California rankings Lead in California PFAS in California

What was found in Rancho Santa Fe'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
746999.9999999999 µg/L 7470%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
Main supplier: SANTA FE I.D. · 21,578 people · 2019
1/1 SYR4
Nitrate
860 µg/L 8.6%
of the EPA limit 10000 µg/L
Main supplier: SANTA FE I.D. · 21,578 people · 2019
1/1 SYR4
Chlorite
460 µg/L 46%
of the EPA limit 1000 µg/L
Main supplier: SANTA FE I.D. · 21,578 people · 2019
1/1 SYR4
Fluoride
307.5 µg/L 7.7%
of the EPA limit 4000 µg/L
Main supplier: SANTA FE I.D. · 21,578 people · 2019
1/1 SYR4
Copper
157 µg/L 12%
of the EPA limit 1300 µg/L
Main supplier: SANTA FE I.D. · 21,578 people · 2019
1/1 SYR4
Barium
118.5 µg/L 5.9%
of the EPA limit 2000 µg/L
Main supplier: SANTA FE I.D. · 21,578 people · 2019
1/1 SYR4
TTHM
68 µg/L 85%
of the EPA limit 80 µg/L
Main supplier: SANTA FE I.D. · 21,578 people · 2019
1/1 SYR4
Lithium
39.8 µg/L
No EPA limit set
Main supplier: SANTA FE I.D. · 21,578 people · 2024
1/1 UCMR-5
Lead
39 µg/L 260%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: SANTA FE I.D. · 21,578 people · 2019
1/1 SYR4
Chloroform
26 µg/L
No EPA limit set
Main supplier: SANTA FE I.D. · 21,578 people · 2019
1/1 SYR4
Dibromochloromethane
25 µg/L
No EPA limit set
Main supplier: SANTA FE I.D. · 21,578 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
24 µg/L 40%
of the EPA limit 60 µg/L
Main supplier: SANTA FE I.D. · 21,578 people · 2019
1/1 SYR4
Bromodichloromethane
22 µg/L
No EPA limit set
Main supplier: SANTA FE I.D. · 21,578 people · 2019
1/1 SYR4
Bromoform
11 µg/L
No EPA limit set
Main supplier: SANTA FE I.D. · 21,578 people · 2019
1/1 SYR4
Dichloroacetic Acid
10 µg/L
No EPA limit set
Main supplier: SANTA FE I.D. · 21,578 people · 2019
1/1 SYR4
Trichloroacetic Acid
9.3 µg/L
No EPA limit set
Main supplier: SANTA FE I.D. · 21,578 people · 2019
1/1 SYR4
Dibromoacetic Acid
6.6 µg/L
No EPA limit set
Main supplier: SANTA FE I.D. · 21,578 people · 2019
1/1 SYR4
Selenium
6.1 µg/L 12%
of the EPA limit 50 µg/L
Main supplier: SANTA FE I.D. · 21,578 people · 2019
1/1 SYR4
Gross Beta Particle Activity
5.8500000000000005 pCi/L
No EPA limit set
Main supplier: SANTA FE I.D. · 21,578 people · 2014
1/1 SYR4
Combined Uranium
4.99895 µg/L 17%
of the EPA limit 30 µg/L
Main supplier: SANTA FE I.D. · 21,578 people · 2014
1/1 SYR4
Arsenic
3.8799999999999994 µg/L 39%
of the EPA limit 10 µg/L
Main supplier: SANTA FE I.D. · 21,578 people · 2019
1/1 SYR4
Monochloroacetic Acid
2.1950000000000003 µg/L
No EPA limit set
Main supplier: SANTA FE I.D. · 21,578 people · 2019
1/1 SYR4
Monobromoacetic Acid
1.2 µg/L
No EPA limit set
Main supplier: SANTA FE I.D. · 21,578 people · 2019
1/1 SYR4
Pfhxa
0.0045 µg/L
No EPA limit set
Main supplier: SANTA FE I.D. · 21,578 people · 2024
1/1 UCMR-5
Pfpea
0.0043 µg/L
No EPA limit set
Main supplier: SANTA FE I.D. · 21,578 people · 2024
1/1 UCMR-5
Lead
0.0017 mg/L 11%
of the EPA limit 0.0150 mg/L
Main supplier: SANTA FE I.D. · 21,578 people · 2025
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 Rancho Santa Fe

SupplierPopulation served
SANTA FE I.D. 21,578

Frequently asked questions about Rancho Santa Fe tap water

Is Rancho Santa Fe tap water safe to drink?

EPA testing detected 26 contaminants in the water serving Rancho Santa Fe. 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 Rancho Santa Fe?

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

What contaminants are in Rancho Santa Fe's water?

The contaminants EPA monitoring detected in Rancho Santa Fe include Nitrate-Nitrite, Nitrate, Chlorite, Fluoride, Copper. 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.