North Shore + East Side Water Report
Covering Haʻikū, Huelo, Keʻanae, Wailua, Nāhiku, and Hāna. City water, wells, and catchment — this region has it all. Compiled from EWG's Tap Water Database and the County of Maui Department of Water Supply.
The most source-diverse region on Maui
Unlike Town, South Side, or West Side — each served by one main system — the North Shore and East Side draw from three genuinely different sources depending on exactly where you live. That means there's no single water report that fits everyone here. Here's how it breaks down:
County water (Haʻikū)
Parts of Haʻikū are served by the County's Upcountry system via Haʻikū and Kaupakalua wells and the Kamole Water Treatment Facility — the same system covered in our Upcountry Water Report. If you're on County water in Haʻikū, that report reflects your water.
County water (Hāna)
Hāna has its own small, separate municipal system, drawing from groundwater. See the data below — it's a genuinely different, cleaner profile than the rest of the island.
Private wells & catchment
Much of Huelo, Keʻanae, Wailua, and Nāhiku — and parts of Haʻikū — rely on private wells or rain catchment systems, with no county oversight or standardized testing. If this is you, see our Off-Grid Water page — you're your own water utility here, and we can help you test and understand exactly what's in your water.
Hāna's Water: What Testing Shows
The good news: no arsenic, chromium, TCP, or DBCP detected
Hāna's municipal system tested for these along with dozens of other contaminants common elsewhere on Maui — none were detected. Testing shows just 4 total contaminants, all disinfection byproducts, all a normal consequence of chlorine treatment rather than any agricultural or industrial legacy.
Total Trihalomethanes (TTHMs)
Cancer riskWhat is this and where does it come from?
Forms when chlorine reacts with naturally occurring organic matter — a byproduct of disinfection, not outside contamination.
Dibromochloromethane
Cancer riskWhat is this and where does it come from?
One of four trihalomethanes formed during disinfection.
Bromoform
Cancer riskWhat is this and where does it come from?
One of four trihalomethanes formed during disinfection.
Bromodichloromethane
Cancer riskWhat is this and where does it come from?
One of four trihalomethanes formed during disinfection. Linked to cancer risk and possible harm to fetal growth.
What this means for you
If you're on Hāna's municipal system, your water is legally compliant and carries a notably cleaner profile than most of Maui — just standard disinfection byproducts, nothing tied to agriculture or industry. If you're on County water in Haʻikū, you share Upcountry's profile. And if you're on a private well or catchment system anywhere in this region, your water hasn't been tested by anyone until you test it yourself — that's the real story for most of this region, and it's the one thing every source type here has in common: on-demand, high-performing filtration that doesn't depend on knowing your exact source in advance.
What's in your pipes matters too. These results describe the water as it leaves the utility's system. On the way to your tap it can pick up lead, copper, or other metals from older city plumbing or from the pipes, fixtures, and solder in your own home. A utility's results can't see that, but testing your tap can.
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We'll help pinpoint which water source serves your address — county, well, or catchment — walk through what it means for your home, and recommend the right filtration. No pressure, just answers.
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