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132 Hawaii water systems have inventoried 336,704 service lines for EPA. 0 (0.0%) are confirmed lead and 34,251 (10%) are still of unknown material. Below: every large or city-linked Hawaii utility ranked by lead lines.
Hawaii water systems reported 0 lead service lines and 529 galvanized lines requiring replacement as of Q2 2026 — 0.0% of the 336,704 lines inventoried and 0.0% of the national lead total, ranking #49 of 51. No Hawaii system in this dataset reports a confirmed lead line yet.
None of the large or city-linked Hawaii systems in EPA's Q2 2026 inventory report a confirmed lead service line, though 34,251 lines statewide are still of unknown material.
Find your utility in the table below, then check its published service line inventory (most utilities post an address-lookup map) or call the number on your water bill. Utilities must notify customers whose line is lead, galvanized-requiring-replacement or unknown. You can also test the pipe entering your home: lead is soft, dull gray, non-magnetic and turns shiny when scratched.
Under EPA's Lead and Copper Rule Improvements, systems must replace lead and galvanized-requiring-replacement lines within 10 years starting in 2027; systems with very high counts can receive longer deadlines. Ask your utility for its replacement plan and whether it covers the homeowner-owned portion.
Use a filter certified to NSF/ANSI 53 for lead for drinking and cooking, flush the tap after water has sat for hours, never use hot tap water for drinking or infant formula, and confirm your actual level with a certified lab test.
Source: EPA SDWIS Service Line Inventory, Q2 2026 snapshot (updated 2026-08-18). Counts are service lines, not people.
A certified mail-in lab test shows exactly what's in your water — lead plus dozens of other contaminants — with EPA-grade accuracy. Know your real levels before spending on a filter.
Certified lab · results in days
Community systems serving 50,000+ people plus systems linked to a city report on this site (7 shown). State totals above include every reporting system.
| # | Water system | Status | Lead | GRR | Unknown | Total lines | City report |
|---|---|---|---|---|---|---|---|
| 1 | WAILUKU HI0000212 · 74,511 served | Lead service lines present | 0 | 293 | 13,359 | 22,989 | |
| 2 | HNL-WINDWARD-PEARL HARBOR HI0000331 · 631,389 served | No lead service lines reported | 0 | 0 | 0 | 109,006 | Honolulu → |
| 3 | WAIPAHU-EWA-WAIANAE HI0000335 · 217,479 served | No lead service lines reported | 0 | 0 | 0 | 41,785 | Waipahu → |
| 4 | JOINT BASE PEARL HARBOR-HICKAM HI0000360 · 65,230 served | Lead service lines present | 0 | 87 | 0 | 22,564 | |
| 5 | MILILANI HI0000367 · 50,573 served | No lead service lines reported | 0 | 0 | 0 | 11,705 | |
| 6 | HILO HI0000101 · 39,477 served | No lead service lines reported | 0 | 0 | 0 | 16,429 | |
| 7 | WAHIAWA HI0000333 · 23,348 served | No lead service lines reported | 0 | 0 | 0 | 5,071 | Wahiawa → |
A lead or unknown service line means lead can enter water after it leaves the treatment plant, so city-level test results understate what reaches your tap. Filter drinking and cooking water with an NSF/ANSI 53 lead-certified system, and see the lead in drinking water guide or Hawaii city water reports.
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