Seneca Wsc, TX
Lead detected, under the action levels
Latest 90th-percentile lead: 0.58 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. 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
Seneca Wsc serves about 917 people through 361 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 groundwater, in Tyler County, Texas. EPA system ID: TX2290011; phone on file: 281-744-8323. 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 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Seneca Wsc is 0.58 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0.58 ppb |
| 2025 | 0 (not detected) |
| 2022 | 0 (not detected) |
How Seneca 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. Seneca Wsc's 0.58 ppb sits at the 54th percentile in Texas and the 44th nationally (higher means more lead).
Other water systems in Tyler County
17 other systems share Tyler County; 8 of them have a higher latest lead result than Seneca Wsc. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Woodville | 6,069 | 0.69 ppb |
| Tyler County Sud | 5,267 | 0.83 ppb |
| Warren Wsc | 1,834 | 0 (not detected) |
| Ivanhoe Land Of Lakes | 1,738 | 0 (not detected) |
| City Of Colmesneil | 1,404 | 0 (not detected) |
| Chester Wsc | 1,237 | 1.37 ppb |
| Cypress Creek Wsc | 853 | 3.16 ppb |
| Doucette Water System | 399 | 3.4 ppb |
| White Tail Ridge Lakes Estates | 233 | 1.1 ppb |
| Lakeside Water Supply 5 | 135 | 10 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Woodville, 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 Seneca 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. Why sampled homes are the worst-case ones is in the guide to reading the number. The action level is dropping - the 10 ppb rule from 2027.