6 named for nitrate itself on the list.
Per the state list or a state web page. Call to confirm.
Located outside Hawaii but on its list.
USGS estimate for Hawaii.
How many labs test for nitrate in Hawaii
6 labs on Hawaii's official drinking-water lab list are certified to test for nitrate. All 6 are named for nitrate on the list. None of them is marked as taking samples from the public. Call a lab before you send a sample. 6 are located outside Hawaii.
The list is published by the Hawaii Department of Health (DOH) - State Laboratories Division, Drinking Water Certification Program; Safe Drinking Water Branch. List versions on file: August 12th, 2026; August 12th, 2026; undated (DOH uploads folder 2026/03; file last modified Aug 21, 2026). Fetched 2026-11-15 (UTC).
Hawaii labs certified for nitrate
| Lab | Location | Nitrate certification | Public samples | Cert. expiry |
|---|---|---|---|---|
| BSK Associates | Fresno, CA | Named on the official list | Public samples: ask the lab | Extended until renewal |
| Eurofins Eaton Analytical, Pomona, CA (formerly MWH Laboratories, Inc.) | Pomona, CA | Named on the official list | Public samples: ask the lab | 1/31/2027 (microbiology); extended until renewal (chemistry) |
| GEL Laboratories, LLC | Charleston, SC | Named on the official list | Public samples: ask the lab | 10/31/2026 Date on list has passed |
| SGS North America Inc. - Wheat Ridge, CO | Wheat Ridge, CO | Named on the official list | Public samples: ask the lab | Extended until renewal |
| Weck Laboratories, Inc. | City of Industry, CA | Named on the official list | Public samples: ask the lab | 1/29/2027 |
| Eurofins South Bend (aka Eurofins Drinking Water and Wastewater Central, LLC - South Bend, IN) | South Bend, IN | Named on the official list | Public samples: ask the lab Looks like a utility or municipal lab, judging by the name (our label, not the state list) | 6/30/2027 |
How the Hawaii list marks public samples (whole list). Not stated in the lists. DOH's index to the lists is written for people "planning to have your drinking water tested" and says to "always confirm the laboratory's current certification status with them before submitting any water samples". DOH's Rainwater Catchment page names one lab for homeowners: "AECOS Laboratory, Inc. is currently the only lab approved by DOH, and is participating in this program" (subsidized lead and copper testing for homes on rainwater catchment).
Before you send a sample, call the lab to confirm it is currently certified for the exact test and method, that it accepts samples from homeowners, and how to collect and ship them. Status can change between list updates.
Why test for nitrate in Hawaii
Nitrate has no taste or smell, and a lab report can state the same water in two units that differ by a factor of 4.43. Read our nitrate explainer.
EPA advises private-well owners to test every year for total coliform bacteria, nitrates, total dissolved solids and pH. [1]
Hawaii guidance that mentions nitrate:
- Hawaii's Department of Health says there are no regulations controlling water quality in private wells serving individual homes and no requirements for regular testing. It refers owners to EPA's advice: test each year for total coliform bacteria, nitrates and any other contaminants of concern in your area, more often if you suspect a problem. EPA also suggests considering pesticides, organic chemicals and heavy metals before first use. [2]
About 56,296 people in Hawaii used private wells in 2015, by the USGS estimate of people on domestic self-supplied water. [3] Federal limits are written for public water systems, not private wells, so testing is up to the owner.
For tests that depend on your home (farms nearby, old plumbing, a new baby), use the which-tests checklist. When results arrive, check your numbers against EPA's limits. State guidance, county data and every lab: Hawaii.
Other tests in Hawaii
- U.S. EPA, Protect your home's water
- Hawaii Department of Health, Safe Drinking Water Branch, Private Water Wells (rev. Oct 21, 2024)
- USGS, Estimated use of water in the United States, county-level data for 2015 (Dieter et al., ver. 2.0, 2018)
- Hawaii DOH State Laboratories Division - Certified Chemistry & Radiochemistry Drinking Water Labs (official list)
- Hawaii DOH State Laboratories Division - Certified Chemistry & Radiochemistry Drinking Water Labs + Drinking Water Microbiology Laboratories Certified by the Hawaii Department of Health (official list)
Hawaii DOH State Laboratories Division - Certified Chemistry & Radiochemistry Drinking Water Labs.
Official source