| Specimen ID | State | County | Locality | Year | HUC Number | Drainage Name | Status |
| 1711710 | WI | Washington | Lucas Lake | 2022 | 04040003 | Milwaukee | |
| 877729 | WI | Washington | Silver Lake | 2015 | 04040003 | Milwaukee | established |
| 1321785 | WI | Washington | Silver Lake | 2015 | 04040003 | Milwaukee | established |
| 1321786 | WI | Washington | Silver Lake | 2015 | 04040003 | Milwaukee | established |
| 1321787 | WI | Washington | Silver Lake | 2015 | 04040003 | Milwaukee | established |
| 1322485 | WI | Washington | Green Lake, south public boat launch | 2016 | 04040003 | Milwaukee | established |
| 1423407 | WI | Washington | Green Lake | 2016 | 04040003 | Milwaukee | established |
| 1427546 | WI | Washington | Silver Lake | 2015 | 04040003 | Milwaukee | established |
| 1545075 | WI | Washington | Little Cedar Lake | 2018 | 04040003 | Milwaukee | established |
| 1567688 | WI | Washington | [No locality description provided] | 2016 | 04040003 | Milwaukee | established |
| 1669771 | WI | Washington | Green Lake | 2016 | 04040003 | Milwaukee | unknown |
| 1669776 | WI | Washington | Green Lake | 2016 | 04040003 | Milwaukee | unknown |
| 1701584 | WI | Washington | [No locality description provided] | 2022 | 04040003 | Milwaukee | |
Citation for this information:
U.S. Geological Survey, 2025,
Nitellopsis obtusa: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov, Access Date: 12/4/2025