All water systems using a surface water source and serving at least 25 individuals per day, or 15 service connections, for more than 60 days per year are required to have a certified operator. Also, all water systems using groundwater and serving at least 25 of the same individuals per day for at least six months per year are required to have a certified operators

Water systems serving less than 25 individuals per day, AND water systems using a groundwater source serving at least 25 different people per day for at least 60 days (transient non-community systems such as restaurants or hotels)

No certified operators required.

Water systems serving fewer than 500 people and fewer than 100 service connections

Small Untreated:

• No chemicals added to the water.
• May have passive forms of treatment, e.g. softening, cartridge filters, etc.

Small Treated:

• One chemical added to the water.
• May have passive forms of treatment, e.g. softening, cartridge filters, etc.

Water Treatment:

• Systems that add more than one chemical, use membrane filtration, conduct chemically aided filtration, or use UV light to meet an inactivation requirement.
• Classified according to a point rating system. View the classification worksheet (XLS)

Water systems serving more than 500 people or more than 100 service connections

Water Treatment:

• Classified according to a point rating system. View the classification worksheet (XLS)

Water Distribution:

• Classified according to the number of service connections, whether water is heated/circulated, and number of pressure zones. View the classification worksheet

Additional detailed information concerning water system classification (PDF 3.2 MB)

Wastewater systems serving fewer than 500 people and fewer than 100 service connections

No certified operators required.

Wastewater systems serving more than 500 people or more than 100 service connections

Wastewater Stabilization Pond:

• Wastewater treatment system that score 1 - 30 points under the wastewater treatment point rating system and where stabilization ponds without aeration are the only means of secondary treatment.

Wastewater Treatment:

• Classified according to a point rating system. Wastewater Treatment Classification worksheet (XLS)

Wastewater Collection:

• Classified according to the number of service connections and number of mainline lift stations. Wastewater Collection Classification worksheet

For additional detailed information concerning wastewater system classification (PDF 3.4 MB)