Community Water System · PWS WA5354100
Mesa Water Department
Operator location Mesa, Washington - 23% of 74 violations are health-based (upper-third health share (> 23%)); groundwater source; 495 served per SDWIS.
- 495
- People served (this PWS)
- 74
- EPA violations (this PWS)
- 17
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Mesa Water Department standing, mid SDWIS violation third
23% of 74 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 23% is upper-third health share (> 23%).
The verdict
Mesa Water Department lands in the middle third by violation volume (74), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (495; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 23% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- 74
- Total EPA violations on record
- 23%
- Health-based (MCL / treatment failure)
- 495
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 163
- County
- Franklin
- School/Daycare
- No
- MCL Violations
- 17
- Monitoring Violations
- 52
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 17 | 2004 |
| Nitrate | MR | 15 | 2023 |
| Total Haloacetic Acids (HAA5) | MR | 3 | 2019 |
| TTHM | MR | 2 | 2019 |
| Coliform (TCR) | MR | 2 | 1997 |
| Endrin | MR | 1 | 2014 |
| BHC-GAMMA | MR | 1 | 2014 |
| Methoxychlor | MR | 1 | 2014 |
| Di(2-ethylhexyl) adipate | MR | 1 | 2014 |
| Simazine | MR | 1 | 2014 |
| Di(2-ethylhexyl) phthalate | MR | 1 | 2014 |
| Atrazine | MR | 1 | 2014 |
| LASSO | MR | 1 | 2014 |
| Heptachlor epoxide | MR | 1 | 2014 |
| Benzo(a)pyrene | MR | 1 | 2014 |
| Chlordane | MR | 1 | 2014 |
| Picloram | MR | 1 | 2014 |
| 2,4,5-TP | MR | 1 | 2014 |
| Pentachlorophenol | MR | 1 | 2014 |
| Lead and Copper Rule | MR | 1 | 1997 |
| Barium | MR | 1 | 1979 |
| Selenium | MR | 1 | 1979 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1979 |
| Fluoride | MR | 1 | 1979 |
| Chromium | MR | 1 | 1979 |
| Asbestos | MR | 1 | 2011 |
| Consumer Confidence Rule | Other | 1 | 1999 |
| Toxaphene | MR | 1 | 2014 |
| Arsenic | MR | 1 | 1979 |
| Cadmium | MR | 1 | 1979 |
Violation Count vs. the National Corpus
Mesa Water Department has 74 recorded EPA violations, 66% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 33% carry more. 23% of this system's own violations are health-based (17 of 74), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
74 Around the middle fewer violations than 33% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
Health-based violations on Mesa Water Department
17 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for WA5354100.
Sources: EPA SDWIS · Washington State Department of Health, Office of Drinking Water
Nationwide peers
74 violations · 495 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
What to do with Mesa Water Department
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Washington compares on the same EPA violation measures. Washington systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.