St Johns Mhp, NM
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. 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.
Who runs the water here
St Johns Mhp serves about 431 people through 167 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Dona Ana County, New Mexico. EPA system ID: NM3540007; phone on file: 575-526-6290. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
Against the period ending 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for St Johns Mhp is 0 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
Against other New Mexico systems
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. St Johns Mhp's reported as 0 (not detected) sits at the 17th percentile in New Mexico and the 21st nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
43 other systems share Dona Ana County; 26 of them have a higher latest lead result than St Johns Mhp. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Las Cruces Municipal Water System | 98,175 | 2 ppb |
| New Mexico State University | 24,000 | 4 ppb |
| Camino Real Regional Utility Authority | 21,930 | 5 ppb |
| Dona Ana Mdwca | 16,987 | 1.9 ppb |
| Lake Section Water Company | 14,619 | 0 (not detected) |
| Moongate West | 13,362 | 0.56 ppb |
| Lower Rio Grande Pwwa South Valley | 11,542 | 0.31 ppb |
| Moongate Water System | 9,170 | 0.51 ppb |
| Anthony W&Sd | 8,691 | 2 ppb |
| University Estates Water System (Lcu) | 5,292 | 0 (not detected) |
Your move
Look up your address in St Johns Mhp'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 St Johns Mhp 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. Why sampled homes are the worst-case ones is in the guide to reading the number. Small systems behave differently: why small systems go over more often.