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Tap water quality report

Arlington City of

EPA monitoring tested this supplier for 81 contaminants and detected 17. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

81
contaminants tested
17
detected
29,508
people served
0
health-based violations
Washington rankingsLead in WashingtonPFAS in Washington
Water source
SWP
Ownership
Local government
Counties served
Snohomish

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
1
violations on file
0
still open
ViolationTypeStatusPeriod
MR Monitoring Archived 1979-10-01 → 1979-10-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFHXS 0.0049 µg/L 2/10 2023

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
TTHM
36.04 µg/L 45%
of the EPA limit 80 µg/L
worst single sample: 73.1 µg/L
98/98 SYR4 2012–2019
Chloroform
31.78 µg/L
No EPA limit set
worst single sample: 67 µg/L
97/98 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
26.975 µg/L 45%
of the EPA limit 60 µg/L
worst single sample: 39.3 µg/L
96/96 SYR4 2012–2019
Dichloroacetic Acid
12.16 µg/L
No EPA limit set
worst single sample: 17 µg/L
95/95 SYR4 2012–2019
Bromodichloromethane
4.1 µg/L
No EPA limit set
worst single sample: 5.3 µg/L
94/96 SYR4 2012–2019
Trichloroacetic Acid
15.075 µg/L
No EPA limit set
worst single sample: 19.7 µg/L
94/94 SYR4 2012–2019
Dibromochloromethane
1.945 µg/L
No EPA limit set
worst single sample: 2.3 µg/L
52/98 SYR4 2012–2019
Nitrate
1633 µg/L 16%
of the EPA limit 10000 µg/L
worst single sample: 1660 µg/L
30/30 SYR4 2012–2019
Barium
15.35 µg/L 0.8%
of the EPA limit 2000 µg/L
worst single sample: 16 µg/L
14/14 SYR4 2012–2019
Nitrate-Nitrite
1621 µg/L 16%
of the EPA limit 10000 µg/L
worst single sample: 1660 µg/L
14/14 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 13/13 LCR 2024
Arsenic
1 µg/L 10%
of the EPA limit 10 µg/L
 10/16 SYR4 2012–2019
Chromium
5 µg/L 5%
of the EPA limit 100 µg/L
 7/14 SYR4 2012–2019
Copper
48 µg/L 3.7%
of the EPA limit 1300 µg/L
worst single sample: 52 µg/L
6/15 SYR4 2012–2019
Monochloroacetic Acid
2.525 µg/L
No EPA limit set
worst single sample: 2.6 µg/L
4/96 SYR4 2012–2019
Bromoform
0.6000 µg/L
No EPA limit set
 2/99 SYR4 2012–2019
64 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosBenzeneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbon TetrachlorideDichloromethaneDibromoacetic AcidEthylbenzeneFluorideGross Beta Particle ActivityHfpo-DaLeadMercuryMonobromoacetic AcidNetfosaaNfdhaNmefosaaNitritePfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
Zachary Resch

Frequently asked questions about Arlington City of

Is Arlington City of tap water safe to drink?

EPA monitoring detected 17 contaminants in Arlington City of'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 Arlington City of's water?

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

How many people does Arlington City of serve?

Arlington City of reports serving 29,508 people in Washington, per its EPA record.

Has Arlington City of had any water quality violations?

The EPA has 1 violation on file for Arlington City of, 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.