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Tap water quality report

Sierra Water

EPA monitoring tested this supplier for 72 contaminants and detected 9. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

72
contaminants tested
9
detected
355
people served
3
health-based violations
Washington rankingsLead in WashingtonPFAS in Washington
Water source
Ground water
Ownership
Local government
Counties served
Pierce

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.

3
health-based violations
47
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 1999-09-01 → 1999-09-30
MCL Health-based Archived 1999-09-01 → 1999-09-30
MCL Health-based Archived 1999-09-01 → 1999-09-30
MR Monitoring Archived 2025-10-01 → 2025-12-31
MR Monitoring Archived 2025-10-01 → 2025-12-31
MR Monitoring Archived 2025-10-01 → 2025-12-31
MR Monitoring Archived 2025-10-01 → 2025-12-31
MR Monitoring Archived 2025-10-01 → 2025-12-31
MR Monitoring Archived 2025-10-01 → 2025-12-31
MR Monitoring Archived 2025-10-01 → 2025-12-31

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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Lead
0.0019 mg/L 13%
of the EPA limit 0.0150 mg/L
 11/11 LCR 2024
Bromodichloromethane
4.4 µg/L
No EPA limit set
 4/5 SYR4 2012–2018
Chloroform
4.5 µg/L
No EPA limit set
 4/5 SYR4 2012–2018
Dibromochloromethane
3 µg/L
No EPA limit set
 4/5 SYR4 2012–2018
TTHM
11.1 µg/L 14%
of the EPA limit 80 µg/L
 4/4 SYR4 2013–2018
Dichloroacetic Acid
2.1 µg/L
No EPA limit set
 3/3 SYR4 2013–2017
Total Haloacetic Acids (HAA5)
4.7 µg/L 7.8%
of the EPA limit 60 µg/L
 3/3 SYR4 2013–2017
Trichloroacetic Acid
2.7 µg/L
No EPA limit set
 3/3 SYR4 2013–2017
Arsenic
1.8 µg/L 18%
of the EPA limit 10 µg/L
 1/2 SYR4 2012–2019
63 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, TotalAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalBromoformChlorobenzeneCopperCyanideCadmiumCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDinosebEthylene DibromideEndrinEthylbenzeneFluorideHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitrateNitrate-NitriteNitritePentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
Sean Vance

Frequently asked questions about Sierra Water

Is Sierra Water tap water safe to drink?

EPA monitoring detected 9 contaminants in Sierra Water'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 Sierra Water's water?

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

How many people does Sierra Water serve?

Sierra Water reports serving 355 people in Washington, per its EPA record.

Has Sierra Water had any water quality violations?

The EPA has 47 violations on file for Sierra Water, of which 3 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.