Los Osos Basin Plumbing Retrofit-On-Sale Program (Title 8)

What is the process?

Complete Title 8 Retrofit Verification Form

Prior to transfer of title, a Title 8: Retrofit Verification Form (Parts 1 and 2) must be completed and submitted to the Department of Planning and Building.  All sections must be filled out correctly for the retrofit certificate to be issued.

  • Circle whether a faucet aerator is present on each of the sinks and the respective flow rate.  If a faucet aerator is not present or flow rate is over 1 gallon-per-minute (gpm), replace and state the new flow rate.
  • If a property contains more than 2 bathrooms, a second Retrofit Verification Form must be submitted with the flow rate of the fixtures for each additional bathroom.
  • The Title 8: Retrofit Verification Form must be completed and signed by either a licensed plumber or a licensed home inspector.

Submit Title 8 Retrofit Verification Form

Submit the completed Title 8: Retrofit Verification Form to [email protected].

Following submittal, the Department of Planning & Building will review the information and, if approved, provide the Seller or Agent, via email, a Title 8: Retrofit Certificate.

Who is eligible?

The Retrofit-On-Sale (Title 8 Retrofit Certificate) is a requirement for all homes being sold in the Los Osos Groundwater Basin.  To view the basin boundary please click here to view our interactive map.

When and where is this service offered?

This service is available throughout the year during regular business hours except during scheduled holidays.


A Title 8 Retrofit Certificate is a formal, County-approved document that certifies a home being sold in the Nipomo or Los Osos Groundwater Basin areas has met all the retrofit requirements for existing plumbing fixtures (toilets, showerheads, faucet aerators).  This includes homes that were built after 1994 and homes that were previously issued a Title 8 Retrofit Certificate.

Existing Toilets Replacement Required? (1.6 or less gpf)
     Greater than 1.6 gpf      Yes
     Less than or equal to 1.6 gpf      No
Existing Showerheads Replacement Required? (2.0 or less gpm)
     Greater than 2.0 gpm      Yes
     Less than or equal to 2.0 gpm      No
Faucet Aerators Must not exceed 1 gpm


To apply, follow the steps outlined in the Los Osos Basin Retrofit-On-Sale service page to complete and submit a Title 8 Retrofit Verification Form to the County of San Luis Obispo Department of Planning & Building.

  • All toilets in a home using more than 1.6 gallons per flush (gpf) must be replaced with toilets less than or equal to 1.6 gpf. 
  • All showerheads in a home using more than 2.5 gallons per minute (gpm) must be replaced with showerheads less than or equal to 2.0 gpm.
  • All faucet aerators in a home must be 1 gpm or less.

Note: the high flow plumbing fixture requirements differ between the Los Osos Basin and the Nipomo Mesa Water Conservation Area. Please be sure to apply to the correct program. You can find which boundary a home is in here.

The Title 8 Retrofit Certificate will be issued via email within 3-5 business days of submittal to the Department of Planning & Building.