South Grayson Sud, TX
Lead detected, under the action levels
Latest 90th-percentile lead: 7.49 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.
South Grayson Sud at a glance
South Grayson Sud serves about 6,750 people through 2,250 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 groundwater, in Grayson County, Texas. EPA system ID: TX0910064; phone on file: 903-482-6231. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
That is up 6.29 ppb from 1.2 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for South Grayson Sud is 7.49 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 7.49 ppb |
| 2022 | 1.2 ppb |
| 2019 | 0 (not detected) |
| 2016 | 1 ppb |
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. South Grayson Sud's 7.49 ppb sits at the 99th percentile in Texas and the 95th nationally (higher means more lead).
Neighbouring systems
39 other systems share Grayson County; 0 of them have a higher latest lead result than South Grayson Sud. 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 Denison | 27,500 | 1.82 ppb |
| City Of Van Alstyne | 10,644 | 0.81 ppb |
| Two Way Sud | 6,804 | 0 (not detected) |
| 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) |
Your move
Test your own tap with a certified lab first-draw sample; Van Alstyne, 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 South Grayson Sud 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. Systems that went over once often dip back under; here is what that means.