Dakota Dunes Cid, SD
Lead detected, under the action levels
Latest 90th-percentile lead: 4 ppb (monitoring period 2025-2025). 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.
Dakota Dunes Cid at a glance
Dakota Dunes Cid serves about 3,700 people through 1,456 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 surface water, in Union County, South Dakota. EPA system ID: SD4602093; phone on file: 6052324211. 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 2 ppb from 2 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Dakota Dunes Cid is 6 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 4 ppb |
| 2022 | 2 ppb |
| 2019 | 4 ppb |
| 2016 | 6 ppb |
How Dakota Dunes Cid compares
Of the 458 South Dakota systems with a lead result, the median latest reading is 2 ppb; 0 are over 15 ppb right now and 6 have gone over at some point. Dakota Dunes Cid's 4 ppb sits at the 88th percentile in South Dakota and the 88th nationally (higher means more lead).
Other water systems in Union County
6 other systems share Union County; 0 of them have a higher latest lead result than Dakota Dunes Cid. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| North Sioux City | 3,042 | 4 ppb |
| Beresford | 2,359 | 4 ppb |
| Elk Point | 2,124 | 2 ppb |
| Clay Rws/South Union | 1,447 | 1 ppb |
| Alcester | 820 | 1 ppb |
| Jefferson | 475 | 1 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Dakota Dunes, SD 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 Dakota Dunes Cid 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. Size matters more than most people expect: small vs large water systems.