LeadPipeLookup

State overview

Lead service lines in Hawaii

Aggregated lead pipe inventory data for all 136 public water systems in Hawaii, serving approximately 1,520,888 residents.

Last verified from EPA SDWIS: 2026-04-14
Water systems
136
Population served
1,520,888
Known lead lines
0
Unknown material
0

Lead Service Lines in Hawaii

What we know about lead pipes in Hawaii

Hawaii's 136 public water systems serve about 1.5 million people. So far, no known lead service lines have been reported in the state's inventory data. This is good news—but it doesn't mean lead pipes don't exist. Many water systems haven't completed a full inventory yet, and older pipes installed before lead was banned (in 1986) may still be underground.

The largest systems serving Hawaii residents are:

  • HNL-Windward-Pearl Harbor (631,000 people)
  • Waipahu-Ewa-Waianae (217,000 people)
  • Wailuku (74,500 people)
  • Joint Base Pearl Harbor-Hickam (65,200 people)
  • Mililani (50,600 people)
  • Hilo (39,500 people)

Why this matters for your home

A lead service line is the pipe that connects your home to the public water main. If yours is made of lead, water can pick up lead as it travels through—especially if the water is corrosive or if the line is disturbed during repairs.

Lead exposure is a health concern, particularly for young children and pregnant people. If you're worried about your family's exposure, talk to your pediatrician or contact the CDC for guidance.

How to find out about your water line

Your water utility has the best information about your service line. Call or visit their website to ask:

  • Is my service line lead, galvanized steel, copper, or plastic?
  • Do you have a map or records for my address?
  • What's your plan to inventory remaining unknown lines?

Even if your utility says they've completed an inventory, it's worth asking directly about your property. Records aren't always accurate, especially for older homes.

Federal funding and upgrades

Hawaii water systems have not received BiL (Bipartisan Infrastructure Law) funding specifically for lead line replacement yet. Check with your local utility about any lead replacement programs, low-income assistance, or water quality testing they may offer.

Next steps for residents

  • Contact your water utility and ask about your service line material.
  • Request a free or low-cost water test if you're concerned about lead in your tap water.
  • Ask about replacement programs and whether your system is hiring contractors for lead line work.
  • Keep an eye on public notices from your utility for updates on lead inventories and replacement timelines.

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Largest public water systems in Hawaii

UtilityPWSIDPopulationKnown leadUnknown
HNL-WINDWARD-PEARL HARBORHI0000331631,389——
WAIPAHU-EWA-WAIANAEHI0000335217,479——
WAILUKUHI000021274,511——
JOINT BASE PEARL HARBOR-HICKAMHI000036065,230——
MILILANIHI000036750,573——
HILOHI000010139,477——
SCHOFIELD BARRACKSHI000034537,920——
LIHUE-KAPAAHI000040034,854——
MAKAWAOHI000021329,868——
NORTH KONAHI000013129,581——
WAHIAWAHI000033323,348——
LAHAINAHI000021420,065——
MARINE CORPS BASE HAWAIIHI000035616,300——
KALAHEO-KOLOAHI000043412,660——
WAIKOLOAHI000013512,100——
WAIPIO HEIGHTSHI000033411,516——
WAIALUA-HALEIWAHI00003329,996——
SOUTH KOHALAHI00001309,612——
KAANAPALIHI00002058,000——
UPPER KULAHI00002157,686——
FORT SHAFTERHI00003417,067——
PRINCEVILLEHI00004286,911——
SOUTH KONAHI00001326,512——
NCTAMS EASTPACHI00003576,470——
OLAA-MOUNTAIN VIEWHI00001126,467——

Cities in Hawaii

More on lead pipes in Hawaii

Frequently asked about lead pipes in Hawaii

How do I know if my house has a lead service line in Hawaii?

Call your local water utility with your address and ask them directly what material your service line is made of. They should have records or be able to send someone to check. You can also look at your water bill or the utility's website for contact information.

Is lead in Hawaiian water a big problem?

No known lead service lines have been reported in Hawaii's current inventory, which is a positive sign. However, inventories aren't always complete, so older homes may still have lead pipes. The best way to know is to ask your water utility.

What should I do if my tap water has lead?

Contact your pediatrician or the CDC for health advice. For your water system, call your utility and request testing or ask about water treatment options like filters or adjustments to water chemistry.

Will my water utility replace my lead service line for free?

It depends on the utility and your eligibility. Ask your local system if they have a lead replacement program or low-income assistance. Some utilities cover the public side of the line; homeowners typically pay for the private side.