Water and Wastewater FAQs

Water and Wastewater


You will need to fill out an application for Application for Accessory Use /TLQ, which is available on this page of our website. Submit the form with a to-scale plot plan showing the details requested on the application and the fee for office review. We will review your application within 10 working days and submit a letter to Ada County or your city, whichever is appropriate. You will only be contacted if we need more information or if we deny the application.

An Application for On-site Sewage Disposal or Site Evaluation is required. Download the form from this page of our website. Submit the application with a to-scale plot plan showing the location of the proposed dwelling site, well site, septic site, and replacement septic site along with the permit fee. Call the Public Health Specialist for your area and set up a time to meet at the site for a test hole.

You will need to fill out an Application for On-site Sewage Disposal or Site Evaluation. Download the form from this page of our website Submit the application with a to-scale plot plan showing the location of proposed dwelling site, well site, septic site, and replacement septic site along with the fee for transfer of permit, providing the permit or application has not expired. If the permit you are attempting to transfer into your name has already been issued, the size of your dwelling and the location of the proposed drainfield must be consistent with the existing permit for a transfer to be approved. If the application or permit has expired, or if we are required to rewrite the permit due to a change in the drainfield location or the number of bedrooms in the home, the full fee for a new permit will need to be paid. If you have more questions, call the Environmental Health office closest to you.

Test holes can be dug anytime of the year. However, if there is more than 6 inches of snow on the ground, a site evaluation after the snow is gone may be required before a permit can be issued.

CDHD does not have a lab. But we can provide you with a sample bottle and instructions on how to collect the sample and a list of laboratories that may do your test. Call the Environmental Health office closest to you if you have further questions.

If you are on a septic system, we require an application and plot plan so that we can verify that the location you are proposing to place your structure will not impact the septic system. You would not want to place your new structure in a location that would allow you to run over either tank or drain field with large equipment, drive over it, or excavate into it when building. Once we make the determination that the new structure will be in the proper location, the appropriate city or county department will be notified that our office approves issuing a building permit. Should your application be turned down, you will be contacted.

The central water fee applies to a review of a subdivision plat that will be served by central water and sewer. The on-site sewage fee applies to a review of a subdivision plat that is proposing the use of individual or community septic systems. Individual or community septic system fees are charged a per buildable lot fee.

If you have recently purchase a property and would like to find information about your septic system you may be able to find it on our searchable database, available on this page of the website.