Mills Engineering Job Openings Posted

Two Job Openings Announced in Phoenix, Arizona

mills engineering



Two positions are open for applications in Phoenix, Arizona.

Mills Engineering is searching for an Executive Assistant and an Engineering Intern.

Visit the Career page for details.


Posted in Uncategorized by Kathy Mills. Comments Off on Mills Engineering Job Openings Posted

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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Posted in Septic System Site Investigations by Kathy Mills. Comments Off on Find Out Online If Seepage Pits Are Allowed at Your Site in Arizona

“How to Manage and Maintain Your Septic System?”

A lot of people in the world do not know how to care and maintain their septic System.  Septic systems are found in both rural and urban areas and maintenance is important for both areas..  Urban areas will likely have more concentrated areas with septic systems making it critical for proper maintenance.

Problems may occur due to insufficient maintenance for Septic System

Most rural homes use some type of septic system to treat household waste water.  These systems generally are economical and effective in treating and disposing of the waste water.  However, your septic system must be properly designed, installed, and maintained to reduce possible harmful impacts to the groundwater that supplies your drinking water, your neighbors’ drinking water, or to surface waters such as a nearby stream.  Although a well-functioning septic system poses little risk to drinking water, a poorly operating system is a potential source of disease-causing bacteria, viruses, household chemicals, and nitrates.  If significant amounts of any of these enter drinking water, they could produce

Read the rest of “How to Manage and Maintain Your Septic System?”