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Tap water quality report

Lower Lake County Water District

EPA monitoring tested this supplier for 72 contaminants and detected 17. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

72
contaminants tested
17
detected
1,326
people served
4
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Local government
Counties served
Lake

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

4
health-based violations
13
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2023-06-20
TT Health-based Resolved 2023-06-20
MCL Health-based Resolved 1997-10-01 → 1997-10-31
MCL Health-based Resolved 1997-10-01 → 1997-10-31
MR Monitoring Resolved 2024-10-01
MR Monitoring Resolved 2024-10-01
MR Monitoring Resolved 1995-05-01 → 1995-05-31
MR Monitoring Resolved 1995-05-01 → 1995-05-31
Other Monitoring Archived 1989-06-01 → 1989-06-30
Other Monitoring Archived 1989-05-01 → 1989-05-31

Other contaminants detected

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 this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
7100 µg/L 71%
of the EPA limit 10000 µg/L
worst single sample: 8000 µg/L
58/184 SYR4 2012–2019
Arsenic
15.6 µg/L 156%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
worst single sample: 26 µg/L
49/58 SYR4 2012–2019
Chloroform
26.3045 µg/L
No EPA limit set
worst single sample: 33.64 µg/L
32/32 SYR4 2012–2019
TTHM
85.896 µg/L 107%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 96 µg/L
32/32 SYR4 2012–2019
Bromodichloromethane
27.215 µg/L
No EPA limit set
worst single sample: 29.22 µg/L
31/32 SYR4 2012–2019
Bromoform
10.825 µg/L
No EPA limit set
worst single sample: 12.36 µg/L
31/32 SYR4 2012–2019
Dibromochloromethane
34.39 µg/L
No EPA limit set
worst single sample: 39.7 µg/L
31/32 SYR4 2012–2019
Dichloroacetic Acid
13.45 µg/L
No EPA limit set
worst single sample: 15.7 µg/L
31/32 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
39.55 µg/L 66%
of the EPA limit 60 µg/L
worst single sample: 42.3 µg/L
31/32 SYR4 2012–2019
Trichloroacetic Acid
17.16 µg/L
No EPA limit set
worst single sample: 20.8 µg/L
29/32 SYR4 2012–2019
Dibromoacetic Acid
12.6 µg/L
No EPA limit set
worst single sample: 13.9 µg/L
27/32 SYR4 2012–2019
Fluoride
582 µg/L 15%
of the EPA limit 4000 µg/L
worst single sample: 620 µg/L
23/23 SYR4 2012–2019
Barium
310 µg/L 16%
of the EPA limit 2000 µg/L
worst single sample: 720 µg/L
21/23 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 15/15 LCR 2025
Monobromoacetic Acid
1.3 µg/L
No EPA limit set
 2/32 SYR4 2012–2019
Diquat
2.8 µg/L 14%
of the EPA limit 20 µg/L
 1/23 SYR4 2012–2019
Mercury
2 µg/L 100%
of the EPA limit 2 µg/L
 1/23 SYR4 2012–2019
55 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBeryllium, TotalChlorobenzeneCopperCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDinosebEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMethoxychlorMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
KINGLAND, JAMES
Phone
707-994-6009
Email
lowerlakewaterworks@gmail.com

Frequently asked questions about Lower Lake County Water District

Is Lower Lake County Water District tap water safe to drink?

EPA monitoring detected 17 contaminants in Lower Lake County Water District's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Lower Lake County Water District's water?

EPA monitoring detected Nitrate, Arsenic, Chloroform, TTHM, Bromodichloromethane, and others. The full list with the level and data source for each is above.

How many people does Lower Lake County Water District serve?

Lower Lake County Water District reports serving 1,326 people in California, per its EPA record.

Has Lower Lake County Water District had any water quality violations?

The EPA has 13 violations on file for Lower Lake County Water District, of which 4 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

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.