City Of Denison, TX
Lead detected, under the action levels
Latest 90th-percentile lead: 1.82 ppb (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. 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.
About City Of Denison
City Of Denison serves about 27,500 people through 17,626 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Grayson County, Texas. EPA system ID: TX0910003; phone on file: 903-465-2720. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
Against the period ending 2022 (1.4 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for City Of Denison is 1.82 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1.82 ppb |
| 2022 | 1.4 ppb |
| 2019 | 1.2 ppb |
| 2016 | 1.3 ppb |
How City Of Denison 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. City Of Denison's 1.82 ppb sits at the 80th percentile in Texas and the 68th nationally (higher means more lead).
Other water systems in Grayson County
39 other systems share Grayson County; 6 of them have a higher latest lead result than City Of Denison. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Sherman | 43,645 | 0 (not detected) |
| City Of Van Alstyne | 10,644 | 0.81 ppb |
| Two Way Sud | 6,804 | 0 (not detected) |
| South Grayson Sud | 6,750 | 7.49 ppb |
| City Of Howe | 4,548 | 0 (not detected) |
| Kentuckytown Wsc | 4,455 | 2.08 ppb |
| Tanglewood On Texoma | 4,341 | 0 (not detected) |
| Luella Sud | 4,200 | 0 (not detected) |
| City Of Whitesboro | 4,192 | 0 (not detected) |
| Northwest Grayson County Wcid 1 | 3,615 | 0 (not detected) |
Next steps for Denison, TX
Test your own tap with a certified lab first-draw sample; Denison, 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 City Of Denison 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.