Is Nob Hill Water Association Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Private
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.

health-based violations

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Archived	1991-12-01 → 1991-12-31
MCL	Health-based	Archived	1991-12-01 → 1991-12-31
MCL	Health-based	Archived	1991-12-01 → 1991-12-31
MCL	Health-based	Archived	1991-12-01 → 1991-12-31
MR	Monitoring	Resolved	2021-10-01 → 2021-12-31
MR	Monitoring	Resolved	2021-10-01 → 2021-12-31
MR	Monitoring	Resolved	2021-10-01 → 2021-12-31
MR	Monitoring	Resolved	2021-10-01 → 2021-12-31
MR	Monitoring	Resolved	2021-10-01 → 2021-12-31
MR	Monitoring	Resolved	2021-10-01 → 2021-12-31

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 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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Nitrate	1410.5 µg/L 14% of the EPA limit 10000 µg/L worst single sample: 2160 µg/L	62/78	SYR4	2012–2019
Nitrate-Nitrite	1325 µg/L 13% of the EPA limit 10000 µg/L worst single sample: 2160 µg/L	31/39	SYR4	2012–2019
Chloroform	10.184 µg/L No EPA limit set worst single sample: 10.4 µg/L	17/29	SYR4	2012–2019
TTHM	19.538 µg/L 24% of the EPA limit 80 µg/L worst single sample: 21.69 µg/L	17/17	SYR4	2012–2019
Bromodichloromethane	6.101 µg/L No EPA limit set worst single sample: 6.57 µg/L	15/29	SYR4	2012–2019
Dibromochloromethane	4.262 µg/L No EPA limit set worst single sample: 4.6 µg/L	14/29	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	13/13	LCR	2024
Barium	22.14 µg/L 1.1% of the EPA limit 2000 µg/L worst single sample: 25.15 µg/L	6/6	SYR4	2012–2019
Bromoform	1.225 µg/L No EPA limit set worst single sample: 1.3 µg/L	6/29	SYR4	2012–2019
Dichloroacetic Acid	7.68 µg/L No EPA limit set worst single sample: 8.54 µg/L	6/22	SYR4	2012–2019
Fluoride	937.5 µg/L 23% of the EPA limit 4000 µg/L worst single sample: 940 µg/L	6/6	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	16.69 µg/L 28% of the EPA limit 60 µg/L worst single sample: 17.92 µg/L	6/21	SYR4	2012–2019
Trichloroacetic Acid	8.212 µg/L No EPA limit set worst single sample: 8.29 µg/L	5/22	SYR4	2012–2019
Copper	9.324 µg/L 0.7% of the EPA limit 1300 µg/L worst single sample: 10.8 µg/L	4/6	SYR4	2012–2019
Chromium	1.939 µg/L 1.9% of the EPA limit 100 µg/L worst single sample: 2.05 µg/L	4/6	SYR4	2012–2019
Thallium, Total	0.5670 µg/L 28% of the EPA limit 2 µg/L worst single sample: 0.6000 µg/L	4/6	SYR4	2012–2019
Lithium	33 µg/L No EPA limit set	4/10	UCMR-5	2024
Lead	0.2610 µg/L 1.7% of the EPA limit 15 µg/L worst single sample: 0.2700 µg/L	3/6	SYR4	2012–2019
Arsenic	3.411 µg/L 34% of the EPA limit 10 µg/L worst single sample: 3.57 µg/L	2/6	SYR4	2012–2019
Dibromoacetic Acid	1.1945 µg/L No EPA limit set worst single sample: 1.2 µg/L	2/22	SYR4	2012–2019
Antimony, Total	0.1000 µg/L 1.7% of the EPA limit 6 µg/L	1/6	SYR4	2012–2019

83 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-PF3ONSAdonaAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitritePfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: Dave England

Frequently asked questions about Nob Hill Water Association

Is Nob Hill Water Association tap water safe to drink?

EPA monitoring detected 21 contaminants in Nob Hill Water Association'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 Nob Hill Water Association's water?

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

How many people does Nob Hill Water Association serve?

Nob Hill Water Association reports serving 38,050 people in Washington, per its EPA record.

Has Nob Hill Water Association had any water quality violations?

The EPA has 26 violations on file for Nob Hill Water Association, 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.