Lead In Drinking Water In Hawaii
What residents of Hawaii need to know about lead in drinking water — including how it enters water, which utilities have documented violations, and what steps to take.
Source: EPA SDWIS, Hawaii Department of Health — Safe Drinking Water Branch (HDOH SDWB), CDC · Last reviewed: 2025-01-01
Quick Answer
Is lead in drinking water a real concern in Hawaii?
Yes — Hawaii's water is naturally soft and low-mineral due to volcanic geology, making it more corrosive toward lead plumbing materials in older homes.
Is this mostly a public-water issue, a private-well issue, or both?
Primarily household plumbing in older pre-1986 buildings; Hawaii has fewer lead service lines than mainland states, but soft water chemistry means older fixtures and solder leach more readily.
What is the main reason residents should care?
Hawaii's volcanic terrain produces naturally soft, low-alkalinity water with little mineral buffering. This water chemistry dissolves lead from older solder, fixtures, and fittings more aggressively than hard water supplies found in many mainland states, even when the water leaving the treatment plant is fully compliant.
Key Facts
| Federal Lead Action Level | 15 µg/L — no safe level per CDC |
| Water chemistry risk | Volcanic groundwater is naturally soft and low-mineral — more corrosive to lead plumbing |
| Primary pathway | Lead solder and older fixtures in pre-1986 household plumbing |
| Urban risk areas | Older Honolulu neighborhoods; older residential communities on all major islands |
| State oversight | Hawaii Department of Health — Safe Drinking Water Branch (HDOH SDWB) |
Why This Matters in Hawaii
Hawaii draws most of its drinking water from groundwater in volcanic rock aquifers and some surface sources. This water is naturally soft and low in dissolved minerals — a characteristic that, while generally pleasant for residents, means the water is more corrosive toward lead-bearing plumbing materials. Honolulu's older neighborhoods — Kalihi, Palama, Kaimuki, and areas of downtown — have pre-1986 housing with older plumbing. Tourist accommodations in historic older buildings may also have aging plumbing. Maui, the Big Island, and Kauai each have older residential communities where pre-1986 construction is common. Hawaii's Board of Water Supply (Honolulu) and state HDOH enforce the Lead and Copper Rule and require utilities to conduct lead service line inventories.
Hawaii Utilities With Lead Violation Records
The utilities listed below have at least one lead violation on record in EPA's SDWIS database. Violations may be open or resolved — see individual utility pages for current status and risk level.
How Lead Gets Into Drinking Water
Lead service lines
The pipe connecting a home to the water main may be made of lead, especially in pre-1986 construction. Water sitting in these lines can accumulate lead before it reaches the tap.
Lead solder
Lead solder at pipe joints was banned for potable water systems in 1986. Homes built before that date — including significant portions of older Hawaii cities — may still have lead solder throughout their plumbing.
Older brass fixtures
Faucets, valves, and fixtures with high lead content were common before the 2014 revision of 'lead-free' standards. Replacing older fixtures at kitchen and drinking taps can meaningfully reduce exposure.
Corrosive water chemistry
Soft, acidic, or low-alkalinity water dissolves lead from plumbing more readily. Utilities use orthophosphate and other corrosion control treatments, but household plumbing after the meter is not within their control.
Who Should Pay Closest Attention
Families with young children in older Honolulu neighborhoods, residents in pre-1986 condominiums and multifamily housing, and renters in older island communities should consider a certified NSF/ANSI 53 or 58 filter for drinking and cooking water, given Hawaii's naturally corrosive water chemistry.
Families with children under six
Pregnant residents
Households in homes built before 1986
Renters who cannot inspect building plumbing
Residents on a confirmed lead service line
Households that had plumbing work done recently (disturbances dislodge protective scale)
How to Check Your Situation in Hawaii
- 1
Identify your water utility. Use the ZIP lookup below or browse the Hawaii utility directory on this site.
- 2
Read your utility's page on this site to see its current risk level and any open lead violations.
- 3
Contact your utility and ask for your address-level service line material status. Under the federal Lead and Copper Rule Revisions (LCRR), utilities must maintain and provide this information.
- 4
Review your utility's most recent Consumer Confidence Report (CCR) — mailed annually or available on the utility's website.
- 5
Consider testing your tap water at a Hawaii Department of Health — Safe Drinking Water Branch (HDOH SDWB)-certified lab. Your state health department or Hawaii Department of Health — Safe Drinking Water Branch (HDOH SDWB) maintains a list of certified labs.
- 6
If you have young children or are pregnant, install a certified NSF/ANSI 53 or 58 filter at the kitchen tap as a precautionary measure.
Treatment Options
Boiling does not remove lead. Use a certified filter for drinking and cooking water.
NSF/ANSI Standard 53 — Activated Carbon Block
Under-sink or pitcher filters certified to Standard 53 are independently verified to reduce lead. Replace filters on the manufacturer's schedule — an overdue filter may not perform as certified.
NSF/ANSI Standard 58 — Reverse Osmosis
RO systems certified to Standard 58 remove 95–99% of lead and a broad range of contaminants. Requires under-sink installation. More comprehensive than Standard 53 for households with multiple contaminant concerns.
Flushing — temporary mitigation only
EPA recommends flushing the cold tap for 30 seconds to 2 minutes if water has sat in pipes for 6+ hours. Not a substitute for certified filtration or service line replacement.
Frequently Asked Questions
Related Pages
Lead — National Overview
All U.S. utilities with lead records
Hawaii State Overview
All utilities and water quality data
Nitrate in Drinking Water
A separate but common concern
Reverse Osmosis Guide
Removes 95–99% of lead
Activated Carbon Filter Guide
NSF/ANSI 53 certified options
All Contaminants
Complete reference library
Data Sources & Provenance
All data on this page is sourced from official U.S. government or public datasets.