NIULII
PWS ID: HI0000139 · HILO, Hawaii 96720
NIULII serves 254 people in HILO, Hawaii using Groundwater water sources. It has 13 recorded EPA violations, including 4 health-based violations. No PFAS contamination was detected in UCMR5 testing.
Water Quality Snapshot: NIULII
NIULII is a local-owned community water system that delivers drinking water to 254 residents in HILO, Hawaii (Hawaii County) through 94 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 13 total violations for this system , of which 4 (31%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. The most recent violation on record dates to 1992.
The most frequently cited contaminant at this system is Coliform (TCR), recorded in 4 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.
Across Hawaii, EPA tracks 137 public water systems serving 1,520,931 people, with 5,234 cumulative violations and 2,289 health-based violations on record. About 80% of systems in the state carry at least one violation, and state-wide the average per system is 38.2 violations. NIULII's 13 violations sit below the Hawaii average. Statewide, 2 of 45 UCMR5-tested systems have reported PFAS detections (4.4%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 94
- County
- Hawaii
- School/Daycare
- No
- MCL Violations
- 4
- Monitoring Violations
- 0
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 4 | 1992 |
Verify This Water System
The figures above are aggregated from EPA's public databases. To verify the underlying records — or to file a complaint, request a Consumer Confidence Report, or check current monitoring status — go directly to the federal and state regulators that enforce the Safe Drinking Water Act for NIULII.
EPA SDWIS — Federal Reports
EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:
View PWS ID HI0000139 on SDWISSource: EPA SDWIS Federal Reports Search
Hawaii Drinking Water Authority
Hawaii's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.
Find HI regulator via EPA SDWISViolation Timeline
Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.
| Year (latest) | Contaminant | Category | Count | EPA Record |
|---|---|---|---|---|
| 1992 | Coliform (TCR) | MCL | 4 | SDWIS / HI0000139 / 3100 |
How NIULII Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | NIULII | Hawaii avg | Federal benchmark |
|---|---|---|---|
| Total violations | 13 | 38.2 | SDWA compliance — any non-zero count is a recorded breach |
| Health-based violations | 4 | 16.7 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | None | 4.4% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 254 | 11,102 | Sizing context for compliance burden |
Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 137 regulated public water systems in Hawaii.
Federal MCL reference — Safe Drinking Water Act thresholds ▼
| Contaminant | Federal MCL / Action Level | Note |
|---|---|---|
| Lead | 0 mg/L (Action Level: 0.015 mg/L) | Lead and Copper Rule treatment technique |
| Arsenic | 0.010 mg/L (10 ppb) | Health-based MCL since 2006 |
| Total Coliform | Treatment technique (RTCR) | Indicator organism, monitoring trigger |
| PFOA / PFOS (PFAS) | 4.0 ppt each (final 2024 rule) | Compliance deadline 2029 |
| Nitrate (as N) | 10 mg/L | Acute health risk for infants |
Frequently Asked Questions
Is NIULII water safe to drink? ▼
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What type of violations does NIULII have? ▼
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Related Data for Hawaii
Read our methodology — how this data is sourced, computed, and verified.