Hana Water Systems - South, HI
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2020-2022). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Hana Water Systems - South at a glance
Hana Water Systems - South serves about 816 people through 81 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in Maui County, Hawaii. EPA system ID: HI0000201; phone on file: 808-243-7238. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
The highest 90th-percentile result EPA holds for Hana Water Systems - South is 0 ppb across 1 monitoring period, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2022 | 0 (not detected) |
Against other Hawaii systems
Of the 112 Hawaii systems with a lead result, the median latest reading is 0 ppb; 0 are over 15 ppb right now and 1 have gone over at some point. Hana Water Systems - South's reported as 0 (not detected) sits at the 41st percentile in Hawaii and the 25th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Maui County
34 other systems share Maui County; 7 of them have a higher latest lead result than Hana Water Systems - South. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Wailuku | 74,511 | 0 (not detected) |
| Makawao | 29,868 | 0.88 ppb |
| Lahaina | 20,065 | 0.78 ppb |
| Kaanapali | 8,000 | 0 (not detected) |
| Upper Kula | 7,686 | 1.7 ppb |
| Kapalua | 4,200 | 0 (not detected) |
| Kaunakakai | 3,702 | 0.77 ppb |
| Lower Kula | 3,522 | 3.7 ppb |
| Lanai City | 3,200 | 0 (not detected) |
| Hoolehua | 2,400 | 0 (not detected) |
Your move
Look up your address in Hana Water Systems - South's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Hana Water Systems - South whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. What a 90th-percentile result does and does not tell you: how to read a lead result. A zero today does not rule out a jump later - the rules are tightening in 2027.