In Columbia County, Wisconsin, which covers part of Lake Wisconsin, we have measured 11,130 parcels on septic and 11,063 on sewer. That is a county measurement. We do not hold a septic count for Lake Wisconsin on its own and this page does not estimate one. Lake Wisconsin also extends into Sauk County, which are reported separately below and are not included in that figure.
Lake Wisconsin is a census-designated place in Columbia and Sauk Counties, Wisconsin. The Census Bureau puts its internal point at 43.36474, -89.59601 and its land area at 13.40 square miles. Septic permitting and record keeping happen at the county level, not the census-designated place level, which is why every figure below is attributed to the county and linked back to the county page it came from.
| County | Records we hold | Parcels on septic | Parcels on sewer | County records portal | Searchable without an account |
|---|---|---|---|---|---|
| Columbia County | 32 | 11,130 | 11,063 | county portal | no account needed |
| Sauk County | 0 | 10,363 | 16,756 | county portal | no account needed |
Our collection for Columbia County, Wisconsin is small, at 32 septic records. Treat it as a starting point for a Lake Wisconsin property rather than a search that settles the question. The county is genuinely mixed: 11,130 of 22,193 classified parcels are on septic and the rest are sewered. Which side of that line a Lake Wisconsin address falls on is worth establishing before anything else. The county publishes a records portal that we were able to search without creating an account, which makes checking a specific parcel something you can do yourself in a few minutes.
Septic is one subject with very different jobs inside it. These go straight to the page that does yours.
| If you are a | Go to | Because it covers |
|---|---|---|
| Homeowner | Septic pumping in Lake Wisconsin | keeping the system you have working |
| Buyer or seller | Buying or selling in Lake Wisconsin | what to pull and check before closing |
| Realtor | Buying or selling in Lake Wisconsin | the same records a seller needs on file |
| Designer or engineer | Septic design in Lake Wisconsin | design flow, tank capacity, dispersal sizing |
| Installer or contractor | Septic installation in Lake Wisconsin | site evaluation, permit sequence, inspection |
| Septic pumper | Septic pumping in Lake Wisconsin | tank access, lids and service interval |
| Inspector | Septic inspection in Lake Wisconsin | what gets checked and what a failure means |
| Land investor | Septic installation in Lake Wisconsin | whether raw land can take a system at all |
No. We measure septic and sewer at parcel level and roll it up by county. In Columbia County, Wisconsin, which covers part of Lake Wisconsin, we have measured 11,130 parcels on septic and 11,063 on sewer. That is a county measurement. We do not hold a septic count for Lake Wisconsin on its own and this page does not estimate one. Lake Wisconsin also extends into Sauk County, which are reported separately below and are not included in that figure.
Lake Wisconsin is in Columbia and Sauk Counties, Wisconsin.
From the Census ZCTA-to-place relationship file, with the share of Lake Wisconsin’s land area that falls in each. A ZIP is not a place boundary and the two only ever partly agree, which is exactly why both pages exist.
Straight-line distance from the Census internal point of Lake Wisconsin.
Parcel Perfect generates a code-shaped septic design and as-built style drawing for a parcel from the records and site data we hold, and shows every parcel we have classified as septic or sewer on one map. Both are open to use for any parcel in Columbia and Sauk Counties, Wisconsin.