Water Quality in Kennewick, WA (99338)
EPA violation data for public water systems serving ZIP code 99338.
37
Total Violations
7
Health-Based
30
Monitoring / Reporting
37
Resolved
What does this mean?
37 of 37 violations have been resolved. 7 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 30 are monitoring or reporting violations (missed testing deadlines or late paperwork — not necessarily a water quality issue). Not all violations mean your water is unsafe. The EPA requires reporting even for minor administrative issues.
Violations Detail (37 total)
| Contaminant | Category | MCL Limit | Measured | Date | Status | Health Effects |
|---|---|---|---|---|---|---|
| TTHM | Health-Based | N/A | 107.4967 | Dec 31, 2023 | Resolved | N/A |
| TTHM | Health-Based | N/A | 89.18 | Sep 30, 2023 | Resolved | N/A |
| TTHM | Health-Based | N/A | 91.295 | Jun 30, 2023 | Resolved | N/A |
| Heptachlor epoxide | Monitoring | N/A | N/A | Jun 30, 2023 | Resolved | N/A |
| Chlordane | Monitoring | N/A | N/A | Jun 30, 2023 | Resolved | N/A |
| Hexachlorocyclopentadiene | Monitoring | N/A | N/A | Jun 30, 2023 | Resolved | N/A |
| LASSO | Monitoring | N/A | N/A | Jun 30, 2023 | Resolved | N/A |
| Methoxychlor | Monitoring | N/A | N/A | Jun 30, 2023 | Resolved | N/A |
| Di(2-ethylhexyl) adipate | Monitoring | N/A | N/A | Jun 30, 2023 | Resolved | N/A |
| Endrin | Monitoring | N/A | N/A | Jun 30, 2023 | Resolved | N/A |
Lead & Copper Levels
Violation Timeline
2023(19)
TTHM
02
TTHM
02
TTHM
02
Heptachlor epoxide
03
Chlordane
03
Hexachlorocyclopentadiene
03
LASSO
03
Methoxychlor
03
Di(2-ethylhexyl) adipate
03
Endrin
03
Benzo(a)pyrene
03
HEXACHLOROBENZENE
03
Toxaphene
03
Di(2-ethylhexyl) phthalate
03
Simazine
03
BHC-GAMMA
03
Heptachlor
03
Atrazine
03
TTHM
02
2022(18)
Total Haloacetic Acids (HAA5)
02
Endrin
03
Toxaphene
03
Di(2-ethylhexyl) adipate
03
Simazine
03
Hexachlorocyclopentadiene
03
LASSO
03
Heptachlor
03
Chlordane
03
BHC-GAMMA
03
Methoxychlor
03
Benzo(a)pyrene
03
Heptachlor epoxide
03
Total Haloacetic Acids (HAA5)
02
HEXACHLOROBENZENE
03
Atrazine
03
Di(2-ethylhexyl) phthalate
03
Total Haloacetic Acids (HAA5)
02
How Does This Compare?
Kennewick (99338) has 37 recorded violations, including 7 health-based. All violations have been resolved, which is a positive sign for current water quality. Consider testing your tap water independently for added peace of mind.
Recommended Water Filters
Based on the contaminants detected in your area, these filter types may help improve your water quality.
Activated Carbon Filter
Excellent for removing chlorine, chloramine, and disinfection byproducts like THMs and HAAs. Available as pitcher filters, countertop, or under-sink units.
Targets:THMs, HAAs, Chlorine, Chloramine, Taste & Odor
Look for:NSF/ANSI 42 & 53 certified
Always look for filters certified by NSF International for the specific contaminants you want to remove.