Rock Island 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.
About Rock Island Wsc
Rock Island Wsc serves about 230 people through 129 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Colorado County, Texas. EPA system ID: TX0450015. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
Against the period ending 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Rock Island Wsc is 0 ppb across 2 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 0 (not detected) |
Where this result ranks
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. Rock Island Wsc's reported as 0 (not detected) sits at the 13th percentile in Texas and the 16th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Colorado County
13 other systems share Colorado County; 7 of them have a higher latest lead result than Rock Island Wsc. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Columbus | 3,860 | 1.04 ppb |
| City Of Eagle Lake | 3,837 | 10.6 ppb |
| City Of Weimar | 2,226 | 3.91 ppb |
| Glidden Fwsd 1 | 855 | 0 (not detected) |
| Lake Sheridan Estates | 750 | 0 (not detected) |
| Colorado County Wcid 2 | 654 | 0 (not detected) |
| Sheridan Wsc | 414 | 1.7 ppb |
| Alleyton Water System | 201 | 0 (not detected) |
| Lazy River Mobile Home Park | 159 | 1.9 ppb |
| Happy Oaks | 150 | 0 (not detected) |
Next steps for Rock Island, TX
Look up your address in Rock Island 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 Rock Island 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. Small systems behave differently: why small systems go over more often.