Mount Zion Wsc, TX
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
Mount Zion Wsc serves about 2,028 people through 676 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 Rockwall County, Texas. EPA system ID: TX1990010; phone on file: 469-377-1399. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is down 1.4 ppb from 1.4 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Mount Zion Wsc is 1.4 ppb across 2 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 1.4 ppb |
How Mount Zion Wsc compares
Of the 4,447 Texas systems with a lead result, the median latest reading is 0.28 ppb; 15 are over 15 ppb right now and 202 have gone over at some point. Mount Zion Wsc's reported as 0 (not detected) sits at the 34th percentile in Texas and the 31st nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
6 other systems share Rockwall County; 5 of them have a higher latest lead result than Mount Zion Wsc. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Rockwall | 55,250 | 1.81 ppb |
| City Of Fate | 29,285 | 1.34 ppb |
| City Of Royse City | 24,313 | 1.8 ppb |
| City Of Heath | 10,464 | 0.99 ppb |
| R C H Wsc | 9,204 | 1.56 ppb |
| Blackland Wsc | 6,171 | 0 (not detected) |
Next steps for Rockwall, TX
Look up your address in Mount Zion Wsc'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 Mount Zion Wsc 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. A zero today does not rule out a jump later - the rules are tightening in 2027.