View the number of systems or populations per system. Select a range of years from 1984 through 2025.
View the number of septic systems (post BMPs). Select a year between 1984 through 2025. Results are displayed by county. Hover the cursor over a county to view county name and number of septic systems. To animate the map, select a starting year and press the ‘play’ button under the year slider.
Note: Data presented for 2025 are from state Phase III WIPs.