Certified well water labs in Hawaii (2026)

WellTestList · Tuesday, October 20, 2026 · state page

Hawaii doesn’t regulate the water in a private well or a home rainwater catchment system. The Department of Health (DOH) says the owner is responsible, and it points you to a lab it has certified. That list is short: only two in-state labs accept samples from the public, AECOS in Kāneʻohe and FQLabs in Honolulu, and neither posts prices. The best deal in the state is for catchment owners: once a year, DOH pays most of the cost of a lead and copper test at AECOS, and you pay just $25 plus shipping. On the Big Island, where most catchment homes are, a local inspector will collect and deliver a lender-ready sample for $649. Mail-in kits run $209–$220.

The short version

1. Well: test bacteria and nitrate every year. That’s the EPA advice DOH repeats for private wells. Before you first drink from a well, also consider pesticides, organic chemicals, and heavy metals. Call AECOS (808-234-7770) or FQLabs (808-839-9444) for bottles and prices, or use a mail-in kit for the broad panel.
2. Catchment: DOH’s four-part screening test. E. coli (must be absent), turbidity (5 NTU or less), lead (0.010 mg/L or less), and copper (1.3 mg/L or less), sampled at the kitchen tap after any filter or UV. Do the lead and copper part through DOH’s subsidized program: $25 plus shipping at AECOS, once a year.
3. Buying with a VA loan? The buyer can’t take the sample. VA requires a disinterested third party to collect and deliver the water sample, and results are good for 90 days. Other lenders set their own rules, so get them in writing first.

How Hawaii’s system actually works

DOH’s private-well fact sheet is blunt: there are no regulations on water quality in private wells serving individual homes, so there are no enforceable limits and no testing requirements. The only way to know your water is safe is to test it. DOH repeats EPA’s advice to test every year for total coliform bacteria and nitrate, plus anything of concern nearby (septic systems and cesspools, farming, industry), and to consider pesticides, organic chemicals, and heavy metals before you first use a well. Compare your results with the federal limits and Hawaii’s own maximum contaminant levels. Hawaii’s are stricter for some farm fumigants and include PFAS (PFOA and PFOS at 4 ng/L each). DOH’s Groundwater Contamination Viewer maps organic chemicals it has confirmed in wells and springs. Questions about which lab is certified for what go to the Safe Drinking Water Branch at 808-586-4258. Sources: DOH Private Water Wells fact sheet (Oct 2024, PDF) · Hawaii MCL table with PFAS (PDF) (checked Oct 20, 2026).

The lab list is the catch. DOH certifies Hawaii labs for drinking-water bacteria, but its current chemistry list (Aug 12, 2026) is entirely mainland labs that are approved for Hawaii. For a homeowner, that means a local lab for bacteria and either a local lab that subcontracts the chemistry or a mail-in kit. DOH’s own advice is to confirm a lab’s current certification before you sample, and to make sure any subcontract lab is Hawaii-approved too. Sources: DOH certified / approved drinking water labs · microbiology list (PDF) · chemistry list (PDF).

Options we verified

• AECOS Laboratory (Kāneʻohe, Oʻahu) — call for fees. One of two in-state labs on DOH’s directory marked as accepting private samples, and DOH-certified for drinking-water bacteria (total coliform and E. coli, certification through 12/31/2026). It’s the only lab in DOH’s subsidized catchment lead and copper program (see below). Its drinking-water page lists nitrate, fluoride, turbidity, metals including arsenic, lead, and copper, pesticides including EDB/DBCP, and volatile organics, but no prices are posted, so we don’t list any. 45-939 Kamehameha Hwy., Suite 104, Kāneʻohe · 808-234-7770. Sources: DOH lab directory (rev. Nov 2025, PDF) · AECOS Laboratory.
• FQLabs (Honolulu, Oʻahu) — call for fees. The other in-state lab that accepts private samples. It’s DOH-certified (provisional, through 2/19/2027) for total coliform and E. coli by Colilert presence/absence, the standard well-bacteria test. No posted prices. 3170-A Ualena St., Honolulu · 808-839-9444 · fql@fqlabs.com · Monday–Friday 8:30 a.m.–5 p.m. Source: FQLabs contact page.
• Big Island Home Inspectors (Hilo) — sample collection, not a lab. On Hawaiʻi Island, this inspector collects the sample on site and delivers it to a local lab, which is useful when a lender won’t let the buyer or seller take it. Catchment panel: total coliform, E. coli, turbidity, lead, copper. Well panel: total coliform, E. coli, nitrate, nitrite, pH, TDS. Price for either: $649 standard (about 10 business days), $999 rush (2 days), $1,199 expedited (1 day), plus 4.712% general excise tax. Those prices cover Volcano to Waimea; elsewhere, add $3 per mile. They say no standard panel automatically satisfies every lender, so get your lender’s written requirements first. 1694 Koele St., Hilo · 808-753-6634. Source: Big Island Catchment & Well Water Testing (checked Oct 20, 2026).

Not open to the public: the county water departments (Hawaiʻi, Honolulu, Kauaʻi, Maui), the DOH district health labs, HECO, and the Navy and Tripler labs. They test public water systems, not homes.

Rainwater catchment: what DOH recommends

CTAHR, the University of Hawaiʻi’s agriculture college, estimates that 30,000 to 60,000 people in Hawaii depend on rainwater catchment, mostly in the Puna, Kaʻū, and Hāmākua districts of Hawaiʻi Island. DOH doesn’t regulate home catchment systems, but it does recommend three things: follow CTAHR’s Rainwater Catchment Systems for Hawaiʻi guidelines (PDF), consider an NSF/UL/WQA-certified filter or treatment unit for whatever concerns you, and pass a screening test at a DOH-certified or -approved lab. A qualified sampler takes the sample after all treatment, usually at the kitchen tap:

• $25 lead and copper test. Once a year, the owner or user of a “legal dwelling” on catchment can send a sample to a participating lab for lead and copper. You pay $25 plus shipping, and DOH pays the rest. AECOS is currently the only approved lab, so ask for the DOH subsidized lead and copper program when you call. DOH can’t pay for any other tests or any other lab.
• Why lead matters here. CTAHR calls lead one of the most serious metal problems in Hawaii catchment, especially in older plantation homes, where lead paint was often used on the roof and inside the tank. Lead also comes from solder, flashing, gutters, and nails, and in newer homes from brass faucets. Acidic rainwater pulls more metal out of roofs, tanks, and pipes.
• During volcanic activity. Ash, laze, and Pele’s hair can carry metals. DOH says to disconnect the gutters feeding the tank until the hazard passes and the roof, gutters, and tank are washed. It strongly recommends chlorine or UV disinfection for catchment water, and testing to prove your treatment works. Home test kits are screening only.

Sources: DOH Rainwater Catchment page (updated July 23, 2026) · Precautionary Measures for Catchment Users During Volcanic Activity (PDF). DOH notes that the CTAHR Hilo phone number printed in older guides for test kits no longer works.

Buying or selling a home with a well or catchment

• VA loans. The VA Lenders Handbook (Chapter 12) requires a disinterested third party to collect and transport the water sample: the health authority, a commercial lab, a licensed sanitary engineer, or someone the health authority accepts. Never the veteran or anyone else with a stake in the sale. Results are valid for 90 days. The appraiser has to note a rainwater catchment system, and the veteran must sign an acknowledgment. DOH’s 2014 catchment-specific VA circular was rescinded on January 1, 2020. Source: VA Pamphlet 26-7, Chapter 12, Topic 16.
• Other loans. We found no Hawaii law requiring a water test at sale. FHA, USDA, and conventional lenders vary, so ask for the analytes and who may collect the sample in writing. For catchment, the DOH four-part screen is the usual starting point.

What to test for in Hawaii

• Bacteria (total coliform / E. coli): every year for wells, and regularly for catchment. In a DOH study of 31 shallow private wells in Hawaiian Paradise Park (Puna), where every home is on a cesspool or septic system, 16 tested positive for coliform and 7 for E. coli. DOH told residents on those wells to run working filtration and disinfection. Source: DOH 2018 Groundwater Status Report (PDF).
• Nitrate: every year for wells, especially near cesspools, septic systems, or farms.
• Lead and copper: the big one for catchment. Use DOH’s $25 subsidized test at AECOS once a year.
• Old farm fumigants (DBCP, TCP, EDB): If your well is in a former pineapple area, ask a lab about these. They were used as soil fumigants and have been found in public wells in central Oʻahu: DBCP at up to 0.27 µg/L at Mililani I (Hawaii’s limit is 0.04 µg/L) and TCP at up to 2.8 µg/L at Mililani III (limit 0.6 µg/L). DOH’s monitoring covers public and select other wells, not private ones. AECOS lists EDB/DBCP methods.
• PFAS: Hawaii’s state limits for PFOA and PFOS are 4 ng/L each. The basic mail-in panels below don’t include PFAS, so ask a lab if you live near a known source. See our PFAS testing guide.

Mail-in kits (for a broader PDF)

These independent labs mail you bottles, run the tests, and email a PDF. Neither one sells softeners. We checked prices tonight. From Hawaii, their strength is the broad metals-and-minerals panel. The weak spot is bacteria: federal drinking-water rules allow no more than 30 hours from sampling to the start of the bacteria test (40 CFR 141.852), and a sample shipped to the mainland usually can’t make that. For bacteria, use AECOS or FQLabs. Mail-in results also aren’t collected by a third party, so they won’t satisfy a VA loan.

• Tap Score / SimpleLab Essential Well: $209 listed (54 analytes including arsenic, uranium, and coliform/E. coli; prepaid return shipping included). For catchment, Tap Score’s Essential Rainwater test is $215 listed (53 analytes, including metals, nitrate, turbidity, and coliform).
• National Testing Laboratories WaterCheck Basic: $220 listed. It requires next-day return shipping, which isn’t included.

On catchment, the best value in Hawaii is DOH’s $25 lead and copper test at AECOS once a year, plus a bacteria test from AECOS or FQLabs (call for fees). On a well, test bacteria and nitrate yearly, and get a broad metals and chemicals panel when you move in. If the sale is on a VA loan, budget for a third-party collector, about $649 on the Big Island.

Side by side for a Hawaii well or catchment

On a phone, the table scrolls sideways.

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