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Tap water quality report

Walla Walla Water Division

EPA monitoring tested this supplier for 105 contaminants and detected 15. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

105
contaminants tested
15
detected
42,959
people served
83
health-based violations
Washington rankingsLead in WashingtonPFAS in Washington
Water source
Surface water
Ownership
Local government
Counties served
Walla Walla

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.

83
health-based violations
141
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2018-12-01
TT Health-based Resolved 2018-12-01
TT Health-based Resolved 2018-11-01
TT Health-based Resolved 2018-11-01
TT Health-based Resolved 2018-10-01
TT Health-based Resolved 2018-10-01
TT Health-based Resolved 2018-09-01
TT Health-based Resolved 2018-09-01
TT Health-based Resolved 2018-08-01
TT Health-based Resolved 2018-08-01

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
22.464 µg/L 28%
of the EPA limit 80 µg/L
worst single sample: 25.5 µg/L
84/84 SYR4 2012–2019
Chloroform
21.62 µg/L
No EPA limit set
worst single sample: 24.2 µg/L
83/87 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
26.8 µg/L 45%
of the EPA limit 60 µg/L
worst single sample: 37.1 µg/L
69/70 SYR4 2012–2019
Trichloroacetic Acid
17.24 µg/L
No EPA limit set
worst single sample: 24.8 µg/L
68/71 SYR4 2012–2019
Bromodichloromethane
1.87 µg/L
No EPA limit set
worst single sample: 2.1 µg/L
67/79 SYR4 2012–2019
Dichloroacetic Acid
13.03 µg/L
No EPA limit set
worst single sample: 14.4 µg/L
63/68 SYR4 2012–2019
Nitrate
2775 µg/L 28%
of the EPA limit 10000 µg/L
worst single sample: 3000 µg/L
36/60 SYR4 2012–2019
Lead
0.0044 mg/L 29%
of the EPA limit 0.0150 mg/L
 15/15 LCR 2025
Barium
7.28 µg/L 0.4%
of the EPA limit 2000 µg/L
worst single sample: 8 µg/L
10/10 SYR4 2012–2019
Fluoride
228 µg/L 5.7%
of the EPA limit 4000 µg/L
worst single sample: 240 µg/L
7/26 SYR4 2012–2019
Nitrate-Nitrite
1175 µg/L 12%
of the EPA limit 10000 µg/L
worst single sample: 1250 µg/L
7/9 SYR4 2012–2019
Copper
51.48 µg/L 4%
of the EPA limit 1300 µg/L
worst single sample: 58.6 µg/L
5/13 SYR4 2012–2019
Dibromochloromethane
0.6900 µg/L
No EPA limit set
worst single sample: 0.7000 µg/L
3/100 SYR4 2012–2019
Arsenic
0.3000 µg/L 3%
of the EPA limit 10 µg/L
 1/26 SYR4 2012–2019
Lead
1.88 µg/L 13%
of the EPA limit 15 µg/L
 1/13 SYR4 2012–2019
90 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, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromoformChlorobenzeneCyanideCadmiumCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDinosebEthylene DibromideEndrinEthylbenzeneGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitritePfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
Scott Holbrook

Frequently asked questions about Walla Walla Water Division

Is Walla Walla Water Division tap water safe to drink?

EPA monitoring detected 15 contaminants in Walla Walla Water 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 Walla Walla Water Division's water?

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

How many people does Walla Walla Water Division serve?

Walla Walla Water Division reports serving 42,959 people in Washington, per its EPA record.

Has Walla Walla Water Division had any water quality violations?

The EPA has 141 violations on file for Walla Walla Water Division, of which 83 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.