Is Washington Aqueduct Division. Tap Water Safe? Quality Report

Water source: Surface water
Ownership: Federal government
Counties served: District of Columbia

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	2008-12-01 → 2008-12-31
TT	Health-based	Resolved	2008-12-01 → 2008-12-31
MCL	Health-based	Archived	1993-10-01 → 1993-10-31
MCL	Health-based	Resolved	1993-09-01 → 1993-09-30
MCL	Health-based	Resolved	1993-09-01 → 1993-09-30
MR	Monitoring	Resolved	2020-06-01 → 2020-06-30
MR	Monitoring	Resolved	2020-06-01 → 2020-06-30
MR	Monitoring	Resolved	2010-10-01 → 2010-10-31
MR	Monitoring	Resolved	2010-10-01 → 2010-10-31
MR	Monitoring	Resolved	2010-10-01 → 2010-10-31

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	2000 µg/L 20% of the EPA limit 10000 µg/L worst single sample: 2100 µg/L	44/44	SYR4	2015–2017
Nitrate-Nitrite	1990 µg/L 20% of the EPA limit 10000 µg/L worst single sample: 2100 µg/L	22/22	SYR4	2015–2017
Fluoride	842.5 µg/L 21% of the EPA limit 4000 µg/L worst single sample: 910 µg/L	16/16	SYR4	2015–2017
Barium	41.5 µg/L 2.1% of the EPA limit 2000 µg/L worst single sample: 42 µg/L	6/6	SYR4	2015–2017
Arsenic	0.3800 µg/L 3.8% of the EPA limit 10 µg/L worst single sample: 0.4000 µg/L	5/6	SYR4	2015–2017
Atrazine	0.1502 µg/L 5% of the EPA limit 3 µg/L worst single sample: 0.1600 µg/L	4/20	SYR4	2015–2017
Copper	7.7 µg/L 0.6% of the EPA limit 1300 µg/L worst single sample: 8 µg/L	4/4	SYR4	2015–2016
Combined Radium (-226 And -228)	0.4072 pCi/L 8.1% of the EPA limit 5 pCi/L worst single sample: 0.4150 pCi/L	3/3	SYR4	2017
Gross Beta Particle Activity	1.597 pCi/L No EPA limit set worst single sample: 1.6 pCi/L	3/3	SYR4	2017
TTHM	54.7 µg/L 68% of the EPA limit 80 µg/L worst single sample: 56 µg/L	3/3	SYR4	2017
Total Haloacetic Acids (HAA5)	43.9 µg/L 73% of the EPA limit 60 µg/L worst single sample: 44 µg/L	3/3	SYR4	2017
Lead	0.0390 mg/L 260% above the EPA limit of 0.0150 mg/L	2/2	LCR	1992
Antimony, Total	0.2000 µg/L 3.3% of the EPA limit 6 µg/L	1/6	SYR4	2015–2017
Dalapon	1.3 µg/L 0.7% of the EPA limit 200 µg/L	1/16	SYR4	2015–2017
Gross Alpha, Excl. Radon And U	0.2190 pCi/L 1.5% of the EPA limit 15 pCi/L	1/1	SYR4	2017
Simazine	0.0700 µg/L 1.8% of the EPA limit 4 µg/L	1/20	SYR4	2015–2017

58 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,3,7,8-TCDD2,4,5-TP2,4-DBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: HALLISSY, NINA
Phone: 202-336-2251
Email: [email protected]

Frequently asked questions about Washington Aqueduct Division.

Is Washington Aqueduct Division. tap water safe to drink?

EPA monitoring detected 16 contaminants in Washington Aqueduct Division.'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 Aqueduct Division.'s water?

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

How many people does Washington Aqueduct Division. serve?

Washington Aqueduct Division. reports serving 0 people in DC, per its EPA record.

Has Washington Aqueduct Division. had any water quality violations?

The EPA has 12 violations on file for Washington Aqueduct Division., of which 5 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.