Second Dwelling


The addition of a detached permanent second dwelling on a residential lot requires a minimum of 1.5 EDUs (Equivalent Dwelling Units) total, or 0.75 EDU per dwelling unit. An EDU pertains to the average water demand for a detached, single-family dwelling unit served by a ¾” water meter. Because you are adding another dwelling to your property, you are responsible to pay for the expected use of that new dwelling unit. Contact Development Services at 530-642-4028 to verify your meter size and determine if additional fees will be required.

Residential Fire Sprinkler Requirements for New Construction

The adoption of residential automatic fire sprinkler systems for one- and two-family dwellings and townhouses for statewide application was approved by the Building Standards Commission on January 12, 2010 (with an effective date of January 1, 2011).

EID’s system is designed and operated to maintain a minimum operating pressure of 40 pounds per square inch (psi) during normal operations, and a residual pressure of 20 psi during the operation of one or more fire hydrants (fire flow) per the California Code of Regulations Title 22, Section 64602. EID recommends that residential fire sprinklers be designed using these minimum operational pressures. These pressures are at the meter, and do not account for losses through the meter. Actual pressures may be considerably higher. EID recommends the designer measure to static pressure at the meter to ensure the appropriate pipe pressure class is used.

If you have any questions, please contact EID Development Services at (530) 642-4028 or

Frequently Asked Questions
If I’m using my existing meter, why do I have to pay additional FCCs?
Additional FCCs are collected to help maintain the water and sewer infrastructure caused by the increased demand initiated by the second dwelling.

Do I need a larger meter?
Development Services staff can not advise you about the appropriate meter size. However, please see our Meter Flow Chart to help you determine an appropriate meter size for your needs.

How will my utility bill change?
Your property will now be considered a multi-family, and multi-family rates will apply. Please contact Customer Service at (530) 642-4000 for rate information, or click here to review the current Rate Schedule.


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