Milligan Wsc, TX
Exceeded the action level in the past
Latest 90th-percentile lead: 0.67 ppb (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 result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
About Milligan Wsc
Milligan Wsc serves about 3,364 people through 1,088 service connections, which makes it a medium-sized system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Collin County, Texas. EPA system ID: TX0430041; phone on file: 972-542-1143. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
Against the period ending 2025 (0.86 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Milligan Wsc is 42 ppb across 5 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0.67 ppb |
| 2025 | 0.86 ppb |
| 2024 | 0.57 ppb |
| 2024 | 0 (not detected) |
| 2019 | 42 ppb over 15 |
Against other Texas systems
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. Milligan Wsc's 0.67 ppb sits at the 57th percentile in Texas and the 46th nationally (higher means more lead).
Nearby utilities
34 other systems share Collin County; 23 of them have a higher latest lead result than Milligan Wsc. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Plano | 292,059 | 1.68 ppb |
| City Of Frisco | 231,910 | 1.4 ppb |
| City Of Mckinney | 224,043 | 1.65 ppb |
| City Of Allen | 113,746 | 1.7 ppb |
| City Of Celina | 52,701 | 1.98 ppb |
| City Of Wylie | 48,393 | 1.03 ppb |
| Town Of Prosper | 42,598 | 1.98 ppb |
| City Of Princeton | 37,019 | 1.76 ppb |
| City Of Melissa | 26,234 | 1.43 ppb |
| Culleoka Wsc | 24,615 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Mckinney, TX 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 Milligan 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. What a 90th-percentile result does and does not tell you: how to read a lead result. More in what a past exceedance means today.