Tap WaterIndex

← Washington

Tap water quality report

Deer Park City of

EPA monitoring tested this supplier for 103 contaminants and detected 19. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

103
contaminants tested
19
detected
5,435
people served
4
health-based violations
Washington rankingsLead in WashingtonPFAS in Washington
Water source
Ground water
Ownership
Local government
Counties served
Spokane

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
107
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 2000-09-01 → 2000-09-30
MCL Health-based Archived 2000-09-01 → 2000-09-30
MCL Health-based Archived 2000-09-01 → 2000-09-30
MCL Health-based Archived 1994-09-01 → 1994-09-30
MR Monitoring Resolved 2025-10-01 → 2025-12-31
MR Monitoring Resolved 2025-10-01 → 2025-12-31
MR Monitoring Resolved 2025-10-01 → 2025-12-31
MR Monitoring Resolved 2025-10-01 → 2025-12-31
MR Monitoring Resolved 2025-10-01 → 2025-12-31
MR Monitoring Resolved 2025-10-01 → 2025-12-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFBS 0.0031 µg/L 1/16 2024
PFNA 0.0043 µg/L 1/16 2024
PFOS 0.0075 µg/L 1/16 2024

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
4589 µg/L 46%
of the EPA limit 10000 µg/L
worst single sample: 5200 µg/L
118/118 SYR4 2012–2019
Copper
18.4075 µg/L 1.4%
of the EPA limit 1300 µg/L
worst single sample: 35.6 µg/L
14/20 SYR4 2015–2019
Lead
0.0016 mg/L 11%
of the EPA limit 0.0150 mg/L
 14/14 LCR 2025
Bromodichloromethane
1.026 µg/L
No EPA limit set
worst single sample: 1.08 µg/L
7/30 SYR4 2012–2019
Bromoform
0.8950 µg/L
No EPA limit set
worst single sample: 0.9100 µg/L
7/30 SYR4 2012–2019
Chloroform
2.73 µg/L
No EPA limit set
worst single sample: 2.79 µg/L
7/30 SYR4 2012–2019
Dibromochloromethane
1.43 µg/L
No EPA limit set
worst single sample: 1.49 µg/L
7/30 SYR4 2012–2019
TTHM
5.608 µg/L 7%
of the EPA limit 80 µg/L
worst single sample: 5.83 µg/L
7/7 SYR4 2013–2019
Arsenic
5.9285 µg/L 59%
of the EPA limit 10 µg/L
worst single sample: 6.11 µg/L
4/4 SYR4 2015–2019
Barium
76.73 µg/L 3.8%
of the EPA limit 2000 µg/L
worst single sample: 79.4 µg/L
4/4 SYR4 2015–2019
Nitrate-Nitrite
4494.5 µg/L 45%
of the EPA limit 10000 µg/L
worst single sample: 4640 µg/L
4/4 SYR4 2015–2019
Fluoride
139.35 µg/L 3.5%
of the EPA limit 4000 µg/L
worst single sample: 140 µg/L
2/4 SYR4 2015–2019
Lead
3.049 µg/L 20%
of the EPA limit 15 µg/L
worst single sample: 3.1 µg/L
2/20 SYR4 2015–2019
Picloram
0.1160 µg/L 0%
of the EPA limit 500 µg/L
 1/6 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
1.23 µg/L 2.1%
of the EPA limit 60 µg/L
 1/8 SYR4 2013–2019
Trichloroacetic Acid
1.23 µg/L
No EPA limit set
 1/8 SYR4 2013–2019
84 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDichloroacetic AcidDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitritePfbaPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFOAPfpeaPfpesPftaPftrdaPfunaPentachlorophenolSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
Clint Drury

Frequently asked questions about Deer Park City of

Is Deer Park City of tap water safe to drink?

EPA monitoring detected 19 contaminants in Deer Park City of'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 Deer Park City of's water?

EPA monitoring detected Nitrate, Copper, Lead, Bromodichloromethane, Bromoform, and others. The full list with the level and data source for each is above.

How many people does Deer Park City of serve?

Deer Park City of reports serving 5,435 people in Washington, per its EPA record.

Has Deer Park City of had any water quality violations?

The EPA has 107 violations on file for Deer Park City of, 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.