Is Patuxent Naval Air Station (Navfac-Wash) Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Federal government
Counties served: St. Mary's

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

161

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Resolved	2000-02-01 → 2000-02-29
MCL	Health-based	Resolved	2000-02-01 → 2000-02-29
MCL	Health-based	Resolved	2000-02-01 → 2000-02-29
MCL	Health-based	Resolved	2000-02-01 → 2000-02-29
MCL	Health-based	Archived	1991-12-01 → 1991-12-31
MCL	Health-based	Archived	1991-12-01 → 1991-12-31
MR	Monitoring	Resolved	2023-06-01 → 2023-08-31
MR	Monitoring	Resolved	2023-06-01 → 2023-08-31
MR	Monitoring	Resolved	2023-06-01 → 2023-08-31
MR	Monitoring	Resolved	2023-06-01 → 2023-08-31

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
Arsenic	9.7 µg/L 97% of the EPA limit 10 µg/L worst single sample: 10.5 µg/L	95/101	SYR4	2012–2019
TTHM	6.495 µg/L 8.1% of the EPA limit 80 µg/L worst single sample: 9.1 µg/L	88/124	SYR4	2012–2019
Chloroform	3.948 µg/L No EPA limit set worst single sample: 15.8 µg/L	37/64	SYR4	2012–2018
Bromodichloromethane	1.85 µg/L No EPA limit set worst single sample: 2.5 µg/L	36/64	SYR4	2012–2018
Fluoride	660 µg/L 17% of the EPA limit 4000 µg/L worst single sample: 950 µg/L	33/33	SYR4	2012–2019
Dibromochloromethane	1.611 µg/L No EPA limit set worst single sample: 1.9 µg/L	30/64	SYR4	2012–2018
Total Haloacetic Acids (HAA5)	4.48 µg/L 7.5% of the EPA limit 60 µg/L worst single sample: 4.9 µg/L	29/122	SYR4	2012–2019
Gross Beta Particle Activity	7.64 pCi/L No EPA limit set worst single sample: 9.2 pCi/L	13/15	SYR4	2012–2014
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	12/12	LCR	2013
Lithium	19.7 µg/L No EPA limit set	6/26	UCMR-5	2025
Barium	18.65 µg/L 0.9% of the EPA limit 2000 µg/L worst single sample: 20 µg/L	4/36	SYR4	2012–2019
Dichloroacetic Acid	1.19 µg/L No EPA limit set worst single sample: 1.2 µg/L	3/46	SYR4	2012–2015
Bromoform	1.3 µg/L No EPA limit set	1/64	SYR4	2012–2018
Toluene	2 µg/L 0.2% of the EPA limit 1000 µg/L	1/26	SYR4	2012–2019

88 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, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDinosebEthylene DibromideEndrinEthylbenzeneGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitrateNitrate-NitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: KRINER, KATIE
Phone: 443-477-1919
Email: [email protected]

Frequently asked questions about Patuxent Naval Air Station (Navfac-Wash)

Is Patuxent Naval Air Station (Navfac-Wash) tap water safe to drink?

EPA monitoring detected 14 contaminants in Patuxent Naval Air Station (Navfac-Wash)'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 Patuxent Naval Air Station (Navfac-Wash)'s water?

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

How many people does Patuxent Naval Air Station (Navfac-Wash) serve?

Patuxent Naval Air Station (Navfac-Wash) reports serving 22,000 people in Maryland, per its EPA record.

Has Patuxent Naval Air Station (Navfac-Wash) had any water quality violations?

The EPA has 161 violations on file for Patuxent Naval Air Station (Navfac-Wash), of which 6 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.