Is Town of Poolesville Tap Water Safe? Quality Report

Water source: Ground water under surface influence
Ownership: Local government
Counties served: Montgomery

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

134

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Resolved	2015-07-01 → 2015-09-30
MCL	Health-based	Resolved	2015-07-01 → 2015-09-30
MCL	Health-based	Resolved	2015-07-01 → 2015-09-30
MCL	Health-based	Resolved	2015-04-01 → 2015-06-30
MCL	Health-based	Resolved	2015-04-01 → 2015-06-30
MCL	Health-based	Resolved	2015-04-01 → 2015-06-30
MCL	Health-based	Resolved	2015-04-01 → 2015-06-30
TT	Health-based	Resolved	2008-04-01 → 2008-04-30
TT	Health-based	Resolved	2008-04-01 → 2008-04-30
TT	Health-based	Resolved	2008-04-01 → 2008-04-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).

Contaminant	Max	Detection rate	Period
PFOA	0.0054 µg/L	9/19	2025
PFOS	0.0065 µg/L	7/19	2025
PFBS	0.0048 µg/L	6/19	2025
Pfhxa	0.0098 µg/L	6/19	2025
Pfpea	0.0151 µg/L	6/19	2025
Pfba	0.0089 µg/L	4/19	2025
Pfhpa	0.0054 µg/L	2/19	2025
PFHXS	0.0069 µg/L	2/19	2025

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	6500 µg/L 65% of the EPA limit 10000 µg/L worst single sample: 7900 µg/L	284/288	SYR4	2012–2019
Gross Alpha, Excl. Radon And U	17.08 pCi/L 114% of the EPA limit, at the 95th percentile of samples — 15 pCi/L worst single sample: 53.95 pCi/L	143/170	SYR4	2012–2019
Combined Uranium	21.8051 µg/L 73% of the EPA limit 30 µg/L worst single sample: 40.9303 µg/L	114/139	SYR4	2012–2019
Combined Radium (-226 And -228)	2.36 pCi/L 47% of the EPA limit 5 pCi/L worst single sample: 3.75 pCi/L	81/91	SYR4	2012–2019
TTHM	23.322 µg/L 29% of the EPA limit 80 µg/L worst single sample: 45.51 µg/L	42/43	SYR4	2012–2019
Chloroform	10.24 µg/L No EPA limit set worst single sample: 12.63 µg/L	37/53	SYR4	2012–2019
Dibromochloromethane	4.0075 µg/L No EPA limit set worst single sample: 6 µg/L	36/54	SYR4	2012–2019
Bromodichloromethane	5.656 µg/L No EPA limit set worst single sample: 8.09 µg/L	35/53	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	9.5995 µg/L 16% of the EPA limit 60 µg/L worst single sample: 11.65 µg/L	34/42	SYR4	2012–2019
Bromoform	1.492 µg/L No EPA limit set worst single sample: 3 µg/L	27/52	SYR4	2012–2019
Barium	1042 µg/L 52% of the EPA limit 2000 µg/L worst single sample: 1050 µg/L	25/27	SYR4	2012–2019
Dichloroacetic Acid	5.0325 µg/L No EPA limit set worst single sample: 10.4 µg/L	20/26	SYR4	2012–2015
Lithium	41.1 µg/L No EPA limit set	19/19	UCMR-5	2025
Dibromoacetic Acid	1.62105 µg/L No EPA limit set worst single sample: 2 µg/L	12/26	SYR4	2012–2015
Lead	0.0050 mg/L 33% of the EPA limit 0.0150 mg/L	11/11	LCR	2018
Gross Beta Particle Activity	6.75 pCi/L No EPA limit set worst single sample: 7.2 pCi/L	10/39	SYR4	2012–2019
Arsenic	2.295 µg/L 23% of the EPA limit 10 µg/L worst single sample: 2.34 µg/L	7/30	SYR4	2012–2018
Nitrate-Nitrite	6800 µg/L 68% of the EPA limit 10000 µg/L	7/7	SYR4	2012–2017
Trichloroacetic Acid	3.847 µg/L No EPA limit set worst single sample: 4.69 µg/L	7/26	SYR4	2012–2015
Selenium	1.836 µg/L 3.7% of the EPA limit 50 µg/L worst single sample: 1.88 µg/L	3/25	SYR4	2012–2018
Fluoride	200 µg/L 5% of the EPA limit 4000 µg/L	1/19	SYR4	2012–2018
Monochloroacetic Acid	3.51 µg/L No EPA limit set	1/26	SYR4	2012–2015

74 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 TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfdaPfdoaPfeesaPfhpsPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: YOST, DARELL
Phone: 240-793-4866
Email: [email protected]

Frequently asked questions about Town of Poolesville

Is Town of Poolesville tap water safe to drink?

EPA monitoring detected 30 contaminants in Town of Poolesville'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 Town of Poolesville's water?

EPA monitoring detected Nitrate, Gross Alpha, Excl. Radon And U, Combined Uranium, Combined Radium (-226 And -228), TTHM, and others. The full list with the level and data source for each is above.

How many people does Town of Poolesville serve?

Town of Poolesville reports serving 6,005 people in Maryland, per its EPA record.

Has Town of Poolesville had any water quality violations?

The EPA has 134 violations on file for Town of Poolesville, of which 10 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.