San Luis City Of, AZ
Lead detected, under the action levels
Latest 90th-percentile lead: 1 ppb (monitoring period 2022-2024). 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
San Luis City Of serves about 39,705 people through 6,100 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 groundwater, in Yuma County, Arizona. EPA system ID: AZ0414005; phone on file: 928-341-8577. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
Against the period ending 2021 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for San Luis City Of is 2 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 1 ppb |
| 2021 | 0 (not detected) |
| 2018 | 2 ppb |
Where this result ranks
Of the 730 Arizona systems with a lead result, the median latest reading is 0 ppb; 9 are over 15 ppb right now and 58 have gone over at some point. San Luis City Of's 1 ppb sits at the 76th percentile in Arizona and the 56th nationally (higher means more lead).
Nearby utilities
18 other systems share Yuma County; 4 of them have a higher latest lead result than San Luis City Of. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Yuma | 103,264 | 1.1 ppb |
| Foothills Water And Sewer Llc | 32,425 | 0 (not detected) |
| Somerton City Of | 14,197 | 1 ppb |
| Usmc Yuma Main System | 8,353 | 3 ppb |
| Aspc Yuma | 4,197 | 0.93 ppb |
| Wellton Town Of | 3,000 | 0.52 ppb |
| Howard Cantonment Area | 1,500 | 1.1 ppb |
| Sierra Pacific Mobile Manor | 816 | 0.54 ppb |
| Tacna Water Improvement District | 500 | 0 (not detected) |
| Shepard Water Company | 430 | 5.3 ppb |
Next steps for San Luis, AZ
Test your own tap with a certified lab first-draw sample; San Luis, AZ 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 San Luis City Of 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. The action level is dropping - the 10 ppb rule from 2027.