Water Quality in SEATTLE, WA (98109)
EPA violation data for public water systems serving ZIP code 98109.
18
Total Violations
6
Health-Based
12
Monitoring / Reporting
12
Resolved
What does this mean?
12 of 18 violations have been resolved. 6 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 12 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 (18 total)
| Contaminant | Category | MCL Limit | Measured | Date | Status | Health Effects |
|---|---|---|---|---|---|---|
| Groundwater Rule | Health-Based | N/A | N/A | Sep 1, 2025 | Active | N/A |
| Groundwater Rule | Health-Based | N/A | N/A | Sep 1, 2025 | Active | N/A |
| Groundwater Rule | Health-Based | N/A | N/A | Sep 1, 2025 | Active | N/A |
| Groundwater Rule | Health-Based | N/A | N/A | Sep 1, 2025 | Active | N/A |
| Groundwater Rule | Health-Based | N/A | N/A | Sep 1, 2025 | Active | N/A |
| Groundwater Rule | Health-Based | N/A | N/A | Sep 1, 2025 | Active | N/A |
| Revised Total Coliform Rule | Monitoring | N/A | N/A | Jul 31, 2025 | Resolved | N/A |
| Nitrate | Monitoring | N/A | N/A | Dec 31, 2023 | Resolved | Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath |
| Surface Water Treatment Rule | Monitoring | N/A | N/A | Jul 31, 2023 | Resolved | N/A |
| Revised Total Coliform Rule | Monitoring | N/A | N/A | Jun 30, 2023 | Resolved | N/A |
Violation Timeline
2025(7)
Groundwater Rule
45
Groundwater Rule
45
Groundwater Rule
45
Groundwater Rule
45
Groundwater Rule
45
Groundwater Rule
45
Revised Total Coliform Rule
3A
2023(3)
Nitrate
03
Surface Water Treatment Rule
36
Revised Total Coliform Rule
3A
How Does This Compare?
SEATTLE (98109) has 18 recorded violations, including 6 health-based. 6 remain unresolved. 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.
Reverse Osmosis System
One of the few filtration methods effective at removing nitrates and nitrites. Essential for households with infants.
Targets:Nitrate, Nitrite, Dissolved Solids
Look for:NSF/ANSI 58 certified
UV Water Purifier
Uses ultraviolet light to neutralize bacteria, viruses, and parasites without chemicals. Ideal for homes with microbial contamination concerns.
Targets:E. coli, Coliform, Giardia, Cryptosporidium
Look for:NSF/ANSI 55 (Class A) certified
Always look for filters certified by NSF International for the specific contaminants you want to remove.