South Sioux City, City Of, NE
Lead detected, under the action levels
Latest 90th-percentile lead: 1.1 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 Sioux City, City Of at a glance
South Sioux City, City Of serves about 14,043 people through 4,482 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 Dakota County, Nebraska. EPA system ID: NE3104309; phone on file: 402-494-7517. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
That is down 2.56 ppb from 3.66 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for South Sioux City, City Of is 5.5 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1.1 ppb |
| 2022 | 3.66 ppb |
| 2019 | 3.86 ppb |
| 2016 | 5.5 ppb |
Against other Nebraska systems
Of the 576 Nebraska systems with a lead result, the median latest reading is 1.55 ppb; 7 are over 15 ppb right now and 29 have gone over at some point. South Sioux City, City Of's 1.1 ppb sits at the 37th percentile in Nebraska and the 57th nationally (higher means more lead).
Other water systems in Dakota County
5 other systems share Dakota County; 4 of them have a higher latest lead result than South Sioux City, City Of. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Dakota City, City Of | 2,081 | 2.35 ppb |
| Dakota Co Rural Water | 2,032 | 3.6 ppb |
| Homer, Village Of | 236 | 0.99 ppb |
| Hubbard, Village Of | 234 | 3.35 ppb |
| Jackson, Village Of | 210 | 1.75 ppb |
Your move
Test your own tap with a certified lab first-draw sample; South Sioux City, NE 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 Sioux City, 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.