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Tap water quality report

North San Juan, CA

EPA monitoring detected 7 contaminants across the 1 water supplier serving North San Juan. 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
90
people served
7
contaminants found
California rankings Lead in California PFAS in California

What was found in North San Juan'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
2800 µg/L 28%
of the EPA limit 10000 µg/L
Main supplier: SHADY LAKE WATER ASSOCIATION · 90 people · 2019
1/1 SYR4
Nitrate-Nitrite
1570 µg/L 16%
of the EPA limit 10000 µg/L
Main supplier: SHADY LAKE WATER ASSOCIATION · 90 people · 2016
1/1 SYR4
Barium
97.73 µg/L 4.9%
of the EPA limit 2000 µg/L
Main supplier: SHADY LAKE WATER ASSOCIATION · 90 people · 2019
1/1 SYR4
Copper
23.1683 µg/L 1.8%
of the EPA limit 1300 µg/L
Main supplier: SHADY LAKE WATER ASSOCIATION · 90 people · 2019
1/1 SYR4
Cadmium
2.74 µg/L 55%
of the EPA limit 5 µg/L
Main supplier: SHADY LAKE WATER ASSOCIATION · 90 people · 2019
1/1 SYR4
Combined Uranium
1.0579 µg/L 3.5%
of the EPA limit 30 µg/L
Main supplier: SHADY LAKE WATER ASSOCIATION · 90 people · 2016
1/1 SYR4
Lead
0.0144 mg/L 96%
of the EPA limit 0.0150 mg/L
Main supplier: SHADY LAKE WATER ASSOCIATION · 90 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 North San Juan

SupplierPopulation served
SHADY LAKE WATER ASSOCIATION 90

Frequently asked questions about North San Juan tap water

Is North San Juan tap water safe to drink?

EPA testing detected 7 contaminants in the water serving North San Juan. 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 North San Juan?

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

What contaminants are in North San Juan's water?

The contaminants EPA monitoring detected in North San Juan include Nitrate, Nitrate-Nitrite, Barium, Copper, Cadmium. 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.