Blanco Mdwca, NM
Lead detected, under the action levels
Latest 90th-percentile lead: 0.69 ppb (monitoring period 2022-2024). 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.
Who runs the water here
Blanco Mdwca serves about 1,148 people through 393 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in San Juan County, New Mexico. EPA system ID: NM3531524; phone on file: 505-632-1661. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
That is down 3.51 ppb from 4.2 ppb in the period ending 2018. The highest 90th-percentile result EPA holds for Blanco Mdwca is 4.2 ppb across 2 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 0.69 ppb |
| 2018 | 4.2 ppb |
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. Blanco Mdwca's 0.69 ppb sits at the 32nd percentile in New Mexico and the 46th nationally (higher means more lead).
Neighbouring systems
13 other systems share San Juan County; 7 of them have a higher latest lead result than Blanco Mdwca. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Farmington Water System | 47,655 | 2.2 ppb |
| Aztec Domestic Water System | 9,673 | 0.7 ppb |
| Bloomfield Water Supply System | 9,536 | 2 ppb |
| Lee Hammond Water | 8,817 | 0.83 ppb |
| Lower Valley Water Users Association | 8,683 | 0.5 ppb |
| Morningstar Water System | 5,694 | 0.55 ppb |
| Northstar Mdwca | 3,784 | 0 (not detected) |
| Flora Vista Mutual Domestic | 3,726 | 0 (not detected) |
| Upper La Plata Water Users Association | 2,265 | 0.6 ppb |
| Southside Mutual Domestic Water | 1,609 | 5 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Blanco, NM 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 Blanco Mdwca 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. Systems that went over once often dip back under; here is what that means.