Gunlock Special Service District, UT
Lead detected, under the action levels
Latest 90th-percentile lead: 1.2 ppb (monitoring period 2023-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
Gunlock Special Service District at a glance
Gunlock Special Service District serves about 118 people through 76 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Washington County, Utah. EPA system ID: UTAH27005; phone on file: 435-574-3789. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
Against the period ending 2016 (1.6 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Gunlock Special Service District is 1.6 ppb across 2 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1.2 ppb |
| 2016 | 1.6 ppb |
Against other Utah systems
Of the 521 Utah systems with a lead result, the median latest reading is 1.71 ppb; 8 are over 15 ppb right now and 27 have gone over at some point. Gunlock Special Service District's 1.2 ppb sits at the 36th percentile in Utah and the 58th nationally (higher means more lead).
Other water systems in Washington County
37 other systems share Washington County; 17 of them have a higher latest lead result than Gunlock Special Service District. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| St George City Water System | 105,240 | 1.4 ppb |
| Washington City | 45,865 | 2.1 ppb |
| Hurricane City | 25,555 | 0.5 ppb |
| Ivins | 10,465 | 2.3 ppb |
| Santa Clara City | 9,000 | 0.6 ppb |
| Hildale - Colorado City | 6,100 | 1 ppb |
| La Verkin City Water System | 4,500 | 2.21 ppb |
| Zion Canyon Water System | 3,380 | 3.15 ppb |
| Enterprise Town Water System | 2,200 | 1.6 ppb |
| Toquerville Town Water System | 1,931 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Gunlock, UT may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Gunlock Special Service District 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. The lead result guide covers how utilities pick the homes they sample. Size matters more than most people expect: small vs large water systems.