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Tap water quality report

Shasta Lake 4510007, CA

EPA monitoring detected 9 contaminants across the 1 water supplier serving Shasta Lake 4510007. 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
10,657
people served
9
contaminants found
California rankings Lead in California PFAS in California

What was found in Shasta Lake 4510007'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
Fluoride
100 µg/L 2.5%
of the EPA limit 4000 µg/L
Main supplier: CITY OF SHASTA LAKE · 10,657 people · 2012
1/1 SYR4
TTHM
41.1 µg/L 51%
of the EPA limit 80 µg/L
Main supplier: CITY OF SHASTA LAKE · 10,657 people · 2019
1/1 SYR4
Chloroform
37.14 µg/L
No EPA limit set
Main supplier: CITY OF SHASTA LAKE · 10,657 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
24.58 µg/L 41%
of the EPA limit 60 µg/L
Main supplier: CITY OF SHASTA LAKE · 10,657 people · 2019
1/1 SYR4
Trichloroacetic Acid
21.42 µg/L
No EPA limit set
Main supplier: CITY OF SHASTA LAKE · 10,657 people · 2019
1/1 SYR4
Dichloroacetic Acid
6.248 µg/L
No EPA limit set
Main supplier: CITY OF SHASTA LAKE · 10,657 people · 2019
1/1 SYR4
Bromodichloromethane
4.7 µg/L
No EPA limit set
Main supplier: CITY OF SHASTA LAKE · 10,657 people · 2019
1/1 SYR4
Dibromoacetic Acid
1.7 µg/L
No EPA limit set
Main supplier: CITY OF SHASTA LAKE · 10,657 people · 2019
1/1 SYR4
Lead
0.0011 mg/L 7.5%
of the EPA limit 0.0150 mg/L
Main supplier: CITY OF SHASTA LAKE · 10,657 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 Shasta Lake 4510007

SupplierPopulation served
CITY OF SHASTA LAKE 10,657

Frequently asked questions about Shasta Lake 4510007 tap water

Is Shasta Lake 4510007 tap water safe to drink?

EPA testing detected 9 contaminants in the water serving Shasta Lake 4510007. 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 Shasta Lake 4510007?

1 public water supplier report drinking-water monitoring for Shasta Lake 4510007, California to the EPA. Each is listed above with its population served.

What contaminants are in Shasta Lake 4510007's water?

The contaminants EPA monitoring detected in Shasta Lake 4510007 include Fluoride, TTHM, Chloroform, Total Haloacetic Acids (HAA5), 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.