Dakota County, Minnesota: septic system inspection at sale
Checked on November 9, 2026 against the official rule. Rule set by Dakota County.
General information, not legal advice. This is our summary of the official rule as we read it. The ordinance or code and the health department decide: confirm with them before you list, sign or close.
The rule
Areas where Dakota County runs the septic program; some cities and townships run their own.
| Question | What the official text says |
|---|---|
| What is required | County page: 'Before selling a property, a licensed Minnesota Pollution Control Agency inspector must conduct a compliance inspection.' Failing system upgraded within 10 months; seller and buyer negotiate cost. Source: dakotacountymn.gov |
| Triggered by | sale, transfer Source: dakotacountymn.gov |
| Deadline | Before selling or transferring property Source: dakotacountymn.gov |
| Who arranges it | seller Source: dakotacountymn.gov |
| Who pays | negotiable Source: dakotacountymn.gov |
| How long a report is valid | Certificate of compliance valid 3 years Source: dakotacountymn.gov |
| Exemptions |
Source: dakotacountymn.gov |
| Who may inspect | Minnesota Pollution Control Agency (MPCA) licensing of SSTS businesses. official list (webapp.pca.state.mn.us) Source: webapp.pca.state.mn.us |
This is our summary of the official rule as we read it. The ordinance or code and the health department decide: confirm with them before you list, sign or close. Rule set by: Dakota County.
Checked on November 9, 2026: read on the official site.
Septic systems in Dakota County: the state’s count
MPCA counts 9,883 septic systems (SSTS) in Dakota County in 2025, the 23rd highest number of Minnesota’s 87 counties. Licensed inspectors and the county did 129 compliance inspections of existing systems that year: 1.3% of the county’s systems, against 2.11% statewide (the 55th highest share). The county issued 116 construction permits in 2025 and 3,784 from 2002 to 2025. MPCA’s table marks the county as requiring a compliance inspection at property transfer, which matches the rule on this page. The county figures include the city and township septic programs inside it (MPCA footnote).
Source: MPCA, 2025 Subsurface Sewage Treatment Systems Annual Report (April 2026), Appendix A, as reported by each county; ranks among the 87 counties in the table (1 = highest). MPCA counts all compliance inspections of existing systems, whatever the trigger (property transfer, building permit and others).
Private wells in Dakota County
In 2015 about 15,276 of Dakota County’s 414,686 residents (4%) got their drinking water from a private well, by the USGS estimate. That is the 84th highest share of the 87 Minnesota counties in the USGS table, and the 28th highest number of private-well users.
As we read it, this rule covers the septic system, not the well.
Source: USGS county water use 2015 (Dieter et al., 2018). Ranks count the Minnesota counties in the USGS table (1 = highest).
Soils and septic systems here
USDA soil surveys rate 88% of Dakota County’s rated land “very limited” for a conventional septic drain field, 12% “somewhat limited” and 0% “not limited”, the 76th highest “very limited” share of 85 Minnesota counties with survey data. The most common limits: slow percolation (dense or clay soil) on 68%; fast seepage below the field (risk to groundwater) on 60%; a high water table (saturated soil near the surface) on 28%.
Where soils are limited, inspections more often find drain fields that sit in seasonally wet soil, and replacement systems are often mounds or other engineered designs. A county-wide rating, not a test of one lot: a site evaluation decides. Source: USDA NRCS Soil Survey Geographic Database (SSURGO), via Soil Data Access, rating “ENG - Septic Tank Absorption Fields”, read November 15, 2026.
Certified labs nearest to Dakota County for a well water test
Labs on the Minnesota certified drinking-water list that the list marks as taking samples from homeowners or outside clients, certified for coliform bacteria, nearest first. 1 of them is in Dakota County.
| Lab | Town | Distance | Certified on the list for |
|---|---|---|---|
| RMB Environmental Laboratories, Inc. - Burnsville | Burnsville, MN · in this county | 8 miles | coliform bacteria, nitrate, arsenic (subcontracted) |
| Pace Analytical Services, LLC - Minneapolis | Minneapolis, MN | 16 miles | coliform bacteria, nitrate, arsenic |
| Twin City Water Clinic, Inc. | Hopkins, MN | 18 miles | coliform bacteria, nitrate, arsenic |
Source: MDH Accredited Labs in Minnesota Accepting Drinking Water Samples from Private Well Users (October 2026; read November 15, 2026). Straight-line distance from the centre of Dakota County (the average of its Census ZIP-area points); “approx.” = lab placed at its ZIP centre. Call the lab first: lists do not say which household tests each lab takes or what it charges.
Nearest other sale-time rules
Buying or selling near a county line? These are the closest other local rules in our census to Dakota County.
| Rule | State | Distance | Covers | Checked |
|---|---|---|---|---|
| Dakota County | Minnesota | same county | Well water test | November 9, 2026 |
| Washington County | Minnesota | about 19 miles | Septic system | November 9, 2026 |
| Rice County | Minnesota | about 29 miles | Septic system | November 9, 2026 |
| Goodhue County | Minnesota | about 32 miles | Septic system | November 9, 2026 |
| Carver County | Minnesota | about 34 miles | Septic system | November 9, 2026 |
Straight-line distance between county centres (the average of each county’s Census ZIP-area points). Townships, villages and health districts are placed at the centre of their county.