Drinking Water Protection
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Environmental Health Division
Schools, Offices, Factories, and Child Care (Nontransient)
Noncommunity Public Water Supply
The information on this page is for facilities such as schools, offices, factories, and child care facilities that serve at least 25 of the same people over six months of the year.
This is considered a nontransient water supply. These facilities are tested at least annually for total coliform bacteria and nitrate. They are also tested for contaminants such as pesticides, solvents, and metals. Contaminants are tested at different frequencies. The frequency will depend on the type of contaminants and the previous results.
- Backflow Prevention Devices and Assemblies (PDF)
- Chlorine Residual Measurement (PDF)
- Cisterns and Below Grade Water Storage Tanks (PDF)
- Cleaning and Disinfecting Non-Pressurized Water Storage Tanks (PDF)
- Coliform Bacteria in Drinking Water (PDF)
- Continuous Disinfection of Groundwater (PDF)
- Cross Connections and Water Softeners (PDF)
- Hand Pump Maintenance and Well Disinfection (PDF)
- Hauled Water for Drinking Water (PDF)
- How to Interpret Drinking Water Lab Results (PDF)
- Isolation Distances from a Water-Supply Well (PDF)
- Noncommunity Public Water Systems in Minnesota (PDF)
- Reducing Children’s Exposure to Lead in Drinking Water (PDF)
- Reducing Lead in Drinking Water: A Manual for Minnesota Schools (PDF)
- Response for E. coli at Public Water Systems (PDF)
- Revised Total Coliform Rule Summary (PDF)
- Sample Collection Procedures
- Sanitary Well Seal (PDF)
- Training Manual: Safe Drinking Water for your Small Water System
- Water Hauler Tank Cleaning and Disinfection (PDF)
- Water Softeners (PDF)
- Well Conversions (PDF)
- Well Disinfection (PDF)
- Wellhead Requirements (PDF)
- Wildfires and Water Quality Concerns (PDF)
- Why Does My Water Smell Like Rotten Eggs? Hydrogen Sulfide
- Drinking Water Operator Certification
A certified water operator is required for nontransient noncommunity public water supply systems, such as schools, offices, factories, and child care facilities.
Last Updated: 06/10/2025