Tap WaterIndex

← Washington

Tap water quality report

Pasco Water Department

EPA monitoring tested this supplier for 105 contaminants and detected 13. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

105
contaminants tested
13
detected
115,102
people served
4
health-based violations
Washington rankingsLead in WashingtonPFAS in Washington
Water source
Surface water
Ownership
Local government
Counties served
Franklin

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.

4
health-based violations
84
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 1993-04-01 → 1993-04-30
MCL Health-based Archived 1991-10-01 → 1991-10-31
MCL Health-based Archived 1991-10-01 → 1991-10-31
MCL Health-based Archived 1991-10-01 → 1991-10-31
MR Monitoring Resolved 2025-01-01 → 2025-12-31
MR Monitoring Resolved 2025-01-01 → 2025-12-31
MR Monitoring Archived 2023-01-01 → 2025-12-31
MR Monitoring Archived 2023-01-01 → 2025-12-31
MR Monitoring Archived 2023-01-01 → 2025-12-31
MR Monitoring Archived 2023-01-01 → 2025-12-31

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
TTHM
58.32 µg/L 73%
of the EPA limit 80 µg/L
worst single sample: 66 µg/L
153/153 SYR4 2012–2019
Chloroform
54.5 µg/L
No EPA limit set
worst single sample: 62.5 µg/L
151/151 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
40.595 µg/L 68%
of the EPA limit 60 µg/L
worst single sample: 52.3 µg/L
148/148 SYR4 2012–2019
Trichloroacetic Acid
21.69 µg/L
No EPA limit set
worst single sample: 34.1 µg/L
147/147 SYR4 2012–2019
Dichloroacetic Acid
18.755 µg/L
No EPA limit set
worst single sample: 23.7 µg/L
144/144 SYR4 2012–2019
Bromodichloromethane
4.5 µg/L
No EPA limit set
worst single sample: 5.3 µg/L
128/128 SYR4 2012–2019
Nitrate
995 µg/L 10%
of the EPA limit 10000 µg/L
worst single sample: 1000 µg/L
22/30 SYR4 2012–2019
Lead
0.0019 mg/L 13%
of the EPA limit 0.0150 mg/L
 17/17 LCR 2023
Dibromochloromethane
0.5850 µg/L
No EPA limit set
worst single sample: 0.6000 µg/L
4/146 SYR4 2012–2019
Barium
28 µg/L 1.4%
of the EPA limit 2000 µg/L
 3/3 SYR4 2015–2019
Fluoride
749 µg/L 19%
of the EPA limit 4000 µg/L
worst single sample: 750 µg/L
3/3 SYR4 2015–2019
Monochloroacetic Acid
2.09 µg/L
No EPA limit set
worst single sample: 2.1 µg/L
3/152 SYR4 2012–2019
Nitrate-Nitrite
489 µg/L 4.9%
of the EPA limit 10000 µg/L
worst single sample: 500 µg/L
3/3 SYR4 2015–2019
92 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, TotalArsenicAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromoformChlorobenzeneCopperCyanideCadmiumCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDinosebEthylene DibromideEndrinEthylbenzeneGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonobromoacetic AcidNetfosaaNfdhaNmefosaaNitritePfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
Derek Wiitala

Frequently asked questions about Pasco Water Department

Is Pasco Water Department tap water safe to drink?

EPA monitoring detected 13 contaminants in Pasco Water Department'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 Pasco Water Department's water?

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

How many people does Pasco Water Department serve?

Pasco Water Department reports serving 115,102 people in Washington, per its EPA record.

Has Pasco Water Department had any water quality violations?

The EPA has 84 violations on file for Pasco Water Department, of which 4 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.