Find Out Online If Seepage Pits Are Allowed at Your Site in Arizona

Are you looking at installing a septic system for your project?  Do you want to find out if you can choose seepage pits for disposal?

New ADEQ Webpage Shows Basin and Range Areas Where Seepage Pits Are Allowed in Arizona

The Arizona Department of Environmental Quality, ADEQ, has a web page that can show you the answer to the question “Are Seepage Pit Tests Allowed?”  Click here to access the web page.

several seepage pits

Arizona Seepage Pit Rule Requirements

The Arizona Administrative Code (state rules) state that seepage pits are only allowed in areas with “valley-fill sediments in a basin-and-range alluval basin.” (AAC R18-9-A311.B.1)

Alluvial basins are typically the areas within valleys that have been filled with hundreds of feet of fill soil washing down from the surrounding mountains.

These areas typically have groundwater several hundred feet below the surface so a seepage pit septic system will have plenty of soil to provide filtering and treatment before the water reaches the groundwater below.

ADEQ Online G.I.S. Map Shows Limits for Seepage Pits

The ADEQ website asks a user to enter the latitude and longitude for a site and optional Owner, Address, and Parcel number.

After the user clicks “Submit,” the Latitude and Longitude are used to locate the site on the G.I.S. map that also shows the boundaries of the basin and range alluvial areas.

The map appears with an X marking the project site and light orange or peach coloring for areas where seepage pits are allowed.

Latitude and Longitude Required to Find Site for Seepage Pit Septic System on Map

To find the latitude and longitude, here are several websites:

Example Showing Seepage Pit is Not Allowed

Here is an example of a site that we recently checked in Phoenix to find out if seepage pits would be allowed (they are not and it is near some hills with rock outcroppings):

Lat: 33.5577

Long: -112.0466




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