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.
25
health-based violations
626
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| MCL | Health-based | Archived | 1998-01-01 → 1998-01-31 |
| MCL | Health-based | Archived | 1998-01-01 → 1998-01-31 |
| MCL | Health-based | Archived | 1998-01-01 → 1998-01-31 |
| MCL | Health-based | Archived | 1997-09-01 → 1997-09-30 |
| MCL | Health-based | Archived | 1997-09-01 → 1997-09-30 |
| MCL | Health-based | Archived | 1997-09-01 → 1997-09-30 |
| MCL | Health-based | Archived | 1997-08-01 → 1997-08-31 |
| MCL | Health-based | Archived | 1997-08-01 → 1997-08-31 |
| MCL | Health-based | Archived | 1997-08-01 → 1997-08-31 |
| MCL | Health-based | Archived | 1992-12-01 → 1992-12-31 |
PFAS detected
PFAS are industrial “forever chemicals”. These are the EPA's latest
nationwide test results (2023–2025).
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 | 5650 µg/L 56% of the EPA limit 10000 µg/L
worst single sample: 8270 µg/L | 178/316 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 5598 µg/L 56% of the EPA limit 10000 µg/L
worst single sample: 8270 µg/L | 89/158 | SYR4 | 2012–2019 |
| Lithium | 35.6 µg/L No EPA limit set | 34/36 | UCMR-5 | 2025 |
| Fluoride | 2819.5 µg/L 70% of the EPA limit 4000 µg/L
worst single sample: 2970 µg/L | 32/32 | SYR4 | 2012–2019 |
| TTHM | 15.42 µg/L 19% of the EPA limit 80 µg/L
worst single sample: 22.2 µg/L | 25/25 | SYR4 | 2012–2019 |
| Bromoform | 11.25 µg/L No EPA limit set
worst single sample: 18.5 µg/L | 23/55 | SYR4 | 2012–2019 |
| Barium | 54.78 µg/L 2.7% of the EPA limit 2000 µg/L
worst single sample: 65.2 µg/L | 21/21 | SYR4 | 2012–2019 |
| Copper | 24.603 µg/L 1.9% of the EPA limit 1300 µg/L
worst single sample: 24.85 µg/L | 20/21 | SYR4 | 2012–2019 |
| Dibromochloromethane | 3.34 µg/L No EPA limit set
worst single sample: 3.7 µg/L | 19/53 | SYR4 | 2012–2019 |
| Lead | 8.389 µg/L 56% of the EPA limit 15 µg/L
worst single sample: 9.19 µg/L | 19/21 | SYR4 | 2012–2019 |
| Arsenic | 3.478 µg/L 35% of the EPA limit 10 µg/L
worst single sample: 4.67 µg/L | 17/21 | SYR4 | 2012–2019 |
| Chromium | 1.7175 µg/L 1.7% of the EPA limit 100 µg/L
worst single sample: 2.73 µg/L | 16/21 | SYR4 | 2012–2019 |
| Thallium, Total | 1.08 µg/L 54% of the EPA limit 2 µg/L
worst single sample: 1.29 µg/L | 15/21 | SYR4 | 2012–2019 |
| Lead | 0.0032 mg/L 21% of the EPA limit 0.0150 mg/L | 14/14 | LCR | 2023 |
| Bromodichloromethane | 2.385 µg/L No EPA limit set
worst single sample: 3.1 µg/L | 12/55 | SYR4 | 2012–2019 |
| Trichloroethylene | 4.878 µg/L 98% of the EPA limit 5 µg/L
worst single sample: 5.34 µg/L | 12/33 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 3.74 µg/L 6.2% of the EPA limit 60 µg/L
worst single sample: 4.5 µg/L | 9/20 | SYR4 | 2012–2018 |
| Chloroform | 2.96 µg/L No EPA limit set
worst single sample: 3.8 µg/L | 8/55 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 2.36 µg/L No EPA limit set
worst single sample: 2.6 µg/L | 7/22 | SYR4 | 2012–2019 |
| Selenium | 1.062 µg/L 2.1% of the EPA limit 50 µg/L
worst single sample: 1.1 µg/L | 5/21 | SYR4 | 2012–2019 |
| cis-1,2-Dichloroethylene | 0.7080 µg/L 1% of the EPA limit 70 µg/L
worst single sample: 0.7100 µg/L | 5/33 | SYR4 | 2012–2019 |
| Antimony, Total | 0.2930 µg/L 4.9% of the EPA limit 6 µg/L
worst single sample: 0.3000 µg/L | 3/21 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 2.735 µg/L No EPA limit set
worst single sample: 2.8 µg/L | 2/22 | SYR4 | 2012–2019 |
| 1,1,2-Trichloroethane | 3.9 µg/L 78% of the EPA limit 5 µg/L | 1/33 | SYR4 | 2012–2019 |
| 1,2-Dichloropropane | 0.6000 µg/L 12% of the EPA limit 5 µg/L | 1/33 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 1.7 µg/L No EPA limit set | 1/22 | SYR4 | 2012–2019 |
73 contaminants tested, none detected
1,1,1-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitritePfbaPfdaPfdoaPfeesaPfhpaPfhpsPfmbaPfmpaPFNAPFOAPfpeaPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl ChlorideXylenes, TotalO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Moses Lake City of
Is Moses Lake City of tap water safe to drink?
EPA monitoring detected 31 contaminants in Moses Lake 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 Moses Lake City of's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Lithium, Fluoride, TTHM, and others. The full list with the level and data source for each is above.
How many people does Moses Lake City of serve?
Moses Lake City of reports serving 32,428 people in Washington, per its EPA record.
Has Moses Lake City of had any water quality violations?
The EPA has 626 violations on file for Moses Lake City of, of which 25 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.