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Tap water quality report

Union Gap Water

EPA monitoring tested this supplier for 102 contaminants and detected 12. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

102
contaminants tested
12
detected
6,433
people served
7
health-based violations
Washington rankingsLead in WashingtonPFAS in Washington
Water source
Ground water
Ownership
Local government
Counties served
Yakima

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.

7
health-based violations
25
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 2005-02-01 → 2005-02-28
MCL Health-based Archived 2004-11-01 → 2004-11-30
MCL Health-based Archived 1999-07-01 → 1999-07-31
MCL Health-based Archived 1999-07-01 → 1999-07-31
MCL Health-based Archived 1999-07-01 → 1999-07-31
MCL Health-based Archived 1996-09-01 → 1996-09-30
MCL Health-based Archived 1996-06-01 → 1996-06-30
MON Monitoring Resolved 2017-12-01 → 2017-12-31
MR Monitoring Resolved 2008-01-01 → 2010-12-31
MR Monitoring Resolved 2008-01-01 → 2010-12-31

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
Nitrate
1790 µg/L 18%
of the EPA limit 10000 µg/L
 42/82 SYR4 2012–2019
Nitrate-Nitrite
1790 µg/L 18%
of the EPA limit 10000 µg/L
 21/41 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 12/12 LCR 2023
Arsenic
6.13 µg/L 61%
of the EPA limit 10 µg/L
 5/5 SYR4 2015–2019
Barium
43.72 µg/L 2.2%
of the EPA limit 2000 µg/L
 5/5 SYR4 2015–2019
Copper
23.02 µg/L 1.8%
of the EPA limit 1300 µg/L
 5/5 SYR4 2015–2019
Chromium
1.91 µg/L 1.9%
of the EPA limit 100 µg/L
 5/5 SYR4 2015–2019
Fluoride
280 µg/L 7%
of the EPA limit 4000 µg/L
 4/5 SYR4 2015–2019
Lead
4.45 µg/L 30%
of the EPA limit 15 µg/L
 2/5 SYR4 2015–2019
Thallium, Total
0.4100 µg/L 21%
of the EPA limit 2 µg/L
 2/5 SYR4 2015–2019
Selenium
0.8900 µg/L 1.8%
of the EPA limit 50 µg/L
 1/5 SYR4 2015–2019
Lithium
9.78 µg/L
No EPA limit set
 1/8 UCMR-5 2024
90 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, TotalBromodichloromethaneBromoformChlorobenzeneCyanideCadmiumCarbon TetrachlorideChlordaneChloroformDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDibromochloromethaneDichloroacetic AcidDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitritePfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneTolueneTotal Haloacetic Acids (HAA5)Total Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
Christopher Fix

Frequently asked questions about Union Gap Water

Is Union Gap Water tap water safe to drink?

EPA monitoring detected 12 contaminants in Union Gap 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 Union Gap Water's water?

EPA monitoring detected Nitrate, Nitrate-Nitrite, Lead, Arsenic, Barium, and others. The full list with the level and data source for each is above.

How many people does Union Gap Water serve?

Union Gap Water reports serving 6,433 people in Washington, per its EPA record.

Has Union Gap Water had any water quality violations?

The EPA has 25 violations on file for Union Gap Water, of which 7 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.