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Tap water quality report

Washington Suburban Sanitary Commission

EPA monitoring tested this supplier for 109 contaminants and detected 24. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

109
contaminants tested
24
detected
1,900,000
people served
0
health-based violations
Maryland rankingsLead in MarylandPFAS in Maryland
Water source
Surface water
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.

0
health-based violations
2
violations on file
0
still open
ViolationTypeStatusPeriod
MR Monitoring Resolved 2007-01-01 → 2007-01-31
MR Monitoring Resolved 1992-01-01 → 1992-09-17

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfhxa 0.0048 µg/L 4/8 2024
Pfpea 0.0067 µg/L 4/8 2024

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Total Haloacetic Acids (HAA5)
58.211 µg/L 97%
of the EPA limit 60 µg/L
worst single sample: 90.2 µg/L
2079/2079 SYR4 2012–2019
TTHM
86.245 µg/L 108%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 115.91 µg/L
2071/2071 SYR4 2012–2019
Bromodichloromethane
20.1 µg/L
No EPA limit set
worst single sample: 24.2 µg/L
1344/1345 SYR4 2012–2019
Chloroform
60 µg/L
No EPA limit set
worst single sample: 89.6 µg/L
1342/1344 SYR4 2012–2019
Dibromochloromethane
7.661 µg/L
No EPA limit set
worst single sample: 13.8 µg/L
1314/1342 SYR4 2012–2019
Dichloroacetic Acid
20.5 µg/L
No EPA limit set
worst single sample: 25.6 µg/L
1156/1157 SYR4 2012–2015
Trichloroacetic Acid
33.05 µg/L
No EPA limit set
worst single sample: 46.7 µg/L
1156/1156 SYR4 2012–2015
Monochloroacetic Acid
2.651 µg/L
No EPA limit set
worst single sample: 3.61 µg/L
520/1156 SYR4 2012–2015
Nitrate
2350 µg/L 24%
of the EPA limit 10000 µg/L
worst single sample: 2750 µg/L
418/418 SYR4 2012–2019
Dibromoacetic Acid
3.54 µg/L
No EPA limit set
worst single sample: 14.8 µg/L
221/1160 SYR4 2012–2015
Nitrate-Nitrite
2355 µg/L 24%
of the EPA limit 10000 µg/L
worst single sample: 2750 µg/L
211/212 SYR4 2012–2019
Barium
41.625 µg/L 2.1%
of the EPA limit 2000 µg/L
worst single sample: 49.6 µg/L
208/214 SYR4 2012–2019
Fluoride
785.2 µg/L 20%
of the EPA limit 4000 µg/L
worst single sample: 926 µg/L
193/203 SYR4 2012–2019
Monobromoacetic Acid
4.932 µg/L
No EPA limit set
worst single sample: 9.56 µg/L
49/1160 SYR4 2012–2015
Bromoform
2.1115 µg/L
No EPA limit set
worst single sample: 2.32 µg/L
38/1320 SYR4 2012–2019
Gross Beta Particle Activity
6.505 pCi/L
No EPA limit set
worst single sample: 7.3 pCi/L
38/105 SYR4 2012–2018
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 16/16 LCR 2020
Chromium
2.1 µg/L 2.1%
of the EPA limit 100 µg/L
 6/217 SYR4 2012–2019
Gross Alpha, Excl. Radon And U
2.24 pCi/L 15%
of the EPA limit 15 pCi/L
worst single sample: 2.3 pCi/L
5/108 SYR4 2012–2018
Atrazine
0.1590 µg/L 5.3%
of the EPA limit 3 µg/L
worst single sample: 0.1600 µg/L
3/104 SYR4 2012–2019
Simazine
0.0846 µg/L 2.1%
of the EPA limit 4 µg/L
worst single sample: 0.0850 µg/L
2/102 SYR4 2012–2019
Thallium, Total
1 µg/L 50%
of the EPA limit 2 µg/L
 1/208 SYR4 2012–2019
85 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumStyreneTetrachloroethyleneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
WRIGHT, KAREN
Phone
301-802-3286
Email
[email protected]

Frequently asked questions about Washington Suburban Sanitary Commission

Is Washington Suburban Sanitary Commission tap water safe to drink?

EPA monitoring detected 24 contaminants in Washington Suburban Sanitary Commission'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 Washington Suburban Sanitary Commission's water?

EPA monitoring detected Total Haloacetic Acids (HAA5), TTHM, Bromodichloromethane, Chloroform, Dibromochloromethane, and others. The full list with the level and data source for each is above.

How many people does Washington Suburban Sanitary Commission serve?

Washington Suburban Sanitary Commission reports serving 1,900,000 people in Maryland, per its EPA record.

Has Washington Suburban Sanitary Commission had any water quality violations?

The EPA has 2 violations on file for Washington Suburban Sanitary Commission, of which 0 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.