Tap WaterIndex

← Washington

Tap water quality report

Boston Harbor

EPA monitoring tested this supplier for 55 contaminants and detected 17. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

55
contaminants tested
17
detected
1,153
people served
11
health-based violations
Washington rankingsLead in WashingtonPFAS in Washington
Water source
Ground water
Ownership
Local government
Counties served
Thurston

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.

11
health-based violations
60
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 2025-07-01 → 2025-09-30
MCL Health-based Archived 2022-01-01 → 2022-03-31
MCL Health-based Resolved 2017-01-01 → 2017-03-31
MCL Health-based Resolved 2017-01-01 → 2017-03-31
MCL Health-based Resolved 2017-01-01 → 2017-03-31
MCL Health-based Resolved 2016-10-01 → 2016-12-31
MCL Health-based Resolved 2016-10-01 → 2016-12-31
MCL Health-based Resolved 2016-10-01 → 2016-12-31
MCL Health-based Resolved 2016-07-01 → 2016-09-30
MCL Health-based Resolved 2016-07-01 → 2016-09-30

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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Chloroform
76.8 µg/L
No EPA limit set
 62/65 SYR4 2012–2019
Bromodichloromethane
33.8 µg/L
No EPA limit set
 51/51 SYR4 2012–2019
TTHM
121.6 µg/L 152%
of the EPA limit, in the worst sample — 80 µg/L
 51/51 SYR4 2012–2019
Dibromochloromethane
11 µg/L
No EPA limit set
 47/51 SYR4 2012–2019
Dichloroacetic Acid
18.886 µg/L
No EPA limit set
 41/41 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
45.4 µg/L 76%
of the EPA limit 60 µg/L
 41/41 SYR4 2012–2019
Trichloroacetic Acid
27.5 µg/L
No EPA limit set
 41/41 SYR4 2012–2019
Dibromoacetic Acid
6.6 µg/L
No EPA limit set
 23/42 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 16/16 LCR 2023
Monochloroacetic Acid
3.9 µg/L
No EPA limit set
 8/42 SYR4 2012–2019
Xylenes, Total
1.23 µg/L 0%
of the EPA limit 10000 µg/L
 8/17 SYR4 2015–2018
Bromoform
0.6500 µg/L
No EPA limit set
 4/52 SYR4 2012–2019
Nitrate
300 µg/L 3%
of the EPA limit 10000 µg/L
 4/18 SYR4 2012–2017
Monobromoacetic Acid
2 µg/L
No EPA limit set
 2/42 SYR4 2012–2019
Arsenic
4.8 µg/L 48%
of the EPA limit 10 µg/L
 1/1 SYR4 2012
Barium
438 µg/L 22%
of the EPA limit 2000 µg/L
 1/1 SYR4 2012
Lead
1.2 µg/L 8%
of the EPA limit 15 µg/L
 1/1 SYR4 2012
38 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalBenzeneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbon TetrachlorideChromiumDichloromethaneDalaponDinosebEthylbenzeneFluorideMercuryNitrate-NitriteNitritePentachlorophenolPicloramSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
Kevin Patching

Frequently asked questions about Boston Harbor

Is Boston Harbor tap water safe to drink?

EPA monitoring detected 17 contaminants in Boston Harbor'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 Boston Harbor's water?

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

How many people does Boston Harbor serve?

Boston Harbor reports serving 1,153 people in Washington, per its EPA record.

Has Boston Harbor had any water quality violations?

The EPA has 60 violations on file for Boston Harbor, of which 11 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.