Grenville Water System, NM
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2026-2026). 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.
Grenville Water System at a glance
Grenville Water System serves about 45 people through 18 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 Union County, New Mexico. EPA system ID: NM3527231; phone on file: 806-664-2672. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Grenville Water System's lead record
Against the period ending 2024 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Grenville Water System is 1.2 ppb across 7 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2020 | 0.7 ppb |
| 2018 | 0.7 ppb |
| 2017 | 1.2 ppb |
| 2016 | 1.2 ppb |
Where this result ranks
Of the 504 New Mexico systems with a lead result, the median latest reading is 1.4 ppb; 14 are over 15 ppb right now and 46 have gone over at some point. Grenville Water System's reported as 0 (not detected) sits at the 1st percentile in New Mexico and the 3rd nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
2 other systems share Union County; 2 of them have a higher latest lead result than Grenville Water System. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Clayton Municipal Supply | 3,250 | 1 ppb |
| Des Moines Water System | 218 | 1 ppb |
Your move
Look up your address in Grenville Water System'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 Grenville Water System 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. Small systems behave differently: why small systems go over more often.