Is Ynp-Old Faithful Tap Water Safe? Quality Report

Water source: Surface water
Ownership: Federal government
Counties served: Teton

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
TT	Health-based	Resolved	2024-07-01
TT	Health-based	Resolved	2024-06-01
TT	Health-based	Resolved	2024-03-01
TT	Health-based	Resolved	2023-11-30
MCL	Health-based	Resolved	2023-10-01 → 2023-12-31
MCL	Health-based	Resolved	2023-10-01 → 2023-12-31
MCL	Health-based	Resolved	2023-07-01 → 2023-09-30
MCL	Health-based	Resolved	2023-07-01 → 2023-09-30
MCL	Health-based	Resolved	2023-04-01 → 2023-06-30
MCL	Health-based	Resolved	2023-04-01 → 2023-06-30

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
Arsenic	12.4 µg/L 124% of the EPA limit, at the 95th percentile of samples — 10 µg/L worst single sample: 21 µg/L	27/27	SYR4	2012–2019
Lead	0.0060 mg/L 40% of the EPA limit 0.0150 mg/L	16/16	LCR	2025
Nitrate-Nitrite	30 µg/L 0.3% of the EPA limit 10000 µg/L	14/18	SYR4	2012–2019
TTHM	65.85 µg/L 82% of the EPA limit 80 µg/L worst single sample: 73 µg/L	14/14	SYR4	2012–2019
Bromodichloromethane	16.45 µg/L No EPA limit set worst single sample: 17 µg/L	12/12	SYR4	2013–2019
Chloroform	45.4 µg/L No EPA limit set worst single sample: 52 µg/L	12/12	SYR4	2013–2019
Dibromochloromethane	7.07 µg/L No EPA limit set worst single sample: 7.4 µg/L	12/12	SYR4	2013–2019
Copper	58.85 µg/L 4.5% of the EPA limit 1300 µg/L worst single sample: 62 µg/L	10/12	SYR4	2014–2017
Fluoride	2520 µg/L 63% of the EPA limit 4000 µg/L worst single sample: 2600 µg/L	9/9	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	49.3 µg/L 82% of the EPA limit 60 µg/L worst single sample: 50 µg/L	8/8	SYR4	2012–2019
Bromoform	1.17 µg/L No EPA limit set worst single sample: 1.2 µg/L	7/12	SYR4	2013–2019
Dibromoacetic Acid	1.275 µg/L No EPA limit set worst single sample: 1.3 µg/L	6/6	SYR4	2013–2019
Dichloroacetic Acid	21 µg/L No EPA limit set worst single sample: 22 µg/L	6/6	SYR4	2013–2019
Lead	8.25 µg/L 55% of the EPA limit 15 µg/L worst single sample: 9 µg/L	6/12	SYR4	2014–2017
Trichloroacetic Acid	25.75 µg/L No EPA limit set worst single sample: 26 µg/L	6/6	SYR4	2013–2019
Monochloroacetic Acid	3.6 µg/L No EPA limit set worst single sample: 4 µg/L	5/6	SYR4	2013–2019
Selenium	2.85 µg/L 5.7% of the EPA limit 50 µg/L worst single sample: 3 µg/L	4/9	SYR4	2012–2019
Antimony, Total	1.9 µg/L 32% of the EPA limit 6 µg/L worst single sample: 2 µg/L	3/9	SYR4	2012–2019
Gross Alpha, Excl. Radon And U	3.425 pCi/L 23% of the EPA limit 15 pCi/L worst single sample: 3.5 pCi/L	2/2	SYR4	2013–2019
Thallium, Total	2.29 µg/L 115% of the EPA limit, at the 95th percentile of samples — 2 µg/L worst single sample: 2.3 µg/L	2/10	SYR4	2012–2019
Combined Radium (-226 And -228)	1.6 pCi/L 32% of the EPA limit 5 pCi/L	1/2	SYR4	2013–2019
Di(2-ethylhexyl) Phthalate	2.1 µg/L 35% of the EPA limit 6 µg/L	1/3	SYR4	2013–2017
Monobromoacetic Acid	0.8000 µg/L No EPA limit set	1/6	SYR4	2013–2019

56 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-DAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorOxamylPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: HOFFMAN, STEVEN
Email: [email protected]

Frequently asked questions about Ynp-Old Faithful

Is Ynp-Old Faithful tap water safe to drink?

EPA monitoring detected 23 contaminants in Ynp-Old Faithful'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 Ynp-Old Faithful's water?

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

How many people does Ynp-Old Faithful serve?

Ynp-Old Faithful reports serving 7,675 people in Wyoming, per its EPA record.

Has Ynp-Old Faithful had any water quality violations?

The EPA has 31 violations on file for Ynp-Old Faithful, of which 18 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.