Community Water System · PWS HI0000214
Lahaina
Operator location Wailuku, Hawaii - 48% of 243 violations are health-based (upper-third health share (> 23%)); surface water source; 20,065 served per SDWIS.
- 20,065
- People served (this PWS)
- 243
- EPA violations (this PWS)
- 116
- Health-based (this PWS)
- No PFAS
- UCMR5 (this PWS)
Lahaina standing, high SDWIS violation third
48% of 243 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 48% is upper-third health share (> 23%). UCMR5: UCMR5 tested, none detected. Population rank #2,701 of 29,740 among systems serving 500+.
The verdict
Lahaina sits in the upper third of the sitemap cohort by violation count (243), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (20,065; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 48% - most of this ledger is MCL or treatment-technique exceedance. UCMR5 tested this system and reported no PFAS above the minimum reporting level.
- #2,701 of 29,740
- Population · /systems
- #12 of 81
- Population · HI
- 243
- Total EPA violations on record
- 48%
- Health-based (MCL / treatment failure)
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
- 3,236
- County
- Maui
- School/Daycare
- No
- MCL Violations
- 23
- Monitoring Violations
- 80
- Treatment Tech Violations
- 93
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Surface Water Treatment Rule | TT | 93 | 1997 |
| Surface Water Treatment Rule | MR | 29 | 1994 |
| Coliform (TCR) | MCL | 23 | 1997 |
| Dalapon | MR | 3 | 2008 |
| Picloram | MR | 3 | 2008 |
| Dinoseb | MR | 3 | 2008 |
| Pentachlorophenol | MR | 3 | 2008 |
| Di(2-ethylhexyl) adipate | MR | 3 | 2008 |
| Diquat | MR | 3 | 2008 |
| Endothall | MR | 3 | 2008 |
| Nitrate | MR | 3 | 2010 |
| Turbidity | MR | 3 | 2016 |
| E. COLI | MR | 3 | 2016 |
| 2,4,5-TP | MR | 3 | 2008 |
| CYANIDE | MR | 3 | 2008 |
| Di(2-ethylhexyl) phthalate | MR | 3 | 2008 |
| Coliform (TCR) | Other | 3 | 1994 |
| Cryptosporidium | MR | 3 | 2016 |
| 2,4-D | MR | 3 | 2008 |
| 2,3,7,8-TCDD | MR | 3 | 2008 |
| Benzo(a)pyrene | MR | 3 | 2008 |
| Coliform (Pre-TCR) | Other | 1 | 1982 |
Violation Count vs. the National Corpus
Lahaina has 243 recorded EPA violations, 88% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 12% carry more. 48% of this system's own violations are health-based (116 of 243), and it ranks #2,701 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
243 Higher than most more violations than 88% 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
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 555 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| NFDHA | 9/19/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| ADONA | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 9/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 9/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 9/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 9/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 9/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 9/19/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFPeS | 9/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxA | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 9/19/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 9/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NEtFOSAA | 9/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 9/19/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 9/19/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFBS | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 9/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 9/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 9/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 9/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 9/19/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| NEtFOSAA | 9/15/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 9/15/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTrDA | 9/15/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 9/15/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 9/15/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 9/15/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| NEtFOSAA | 9/15/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 9/15/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTA | 9/15/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 9/15/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 9/15/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 9/15/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTA | 9/15/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 9/15/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 9/15/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 9/15/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFMPA | 5/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| NMeFOSAA | 5/19/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 5/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 5/19/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFHpS | 5/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
Health-based violations on Lahaina
116 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for HI0000214.
Sources: EPA SDWIS
Nationwide peers
243 violations · 20,065 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Lahaina
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Hawaii compares on the same EPA violation measures. Hawaii 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.