Sewer Rates

Sewer Rates

In addition to water service, IRWD provides sewage collection and treatment services to most of our service area. We capture wastewater and reuse it through our innovative water recycling program. Here is an "at a glance" view of sewer rates. Complete rate information is available in the IRWD Rates and Charges document.

Rate Calculators

Click here to use a rate calculator to estimate your bill and see how the rate structure works.


Residential Sewer Rates - Single Family Residence and Multi Family Dwelling Units

Average Monthly Water Use
Exceeds 10 ccfs
Falls between 5 and 10 ccfs
Falls below 5 ccfs

Collection Service Charge (based on 10.0ccf flows)
Treatment Service Charge (based on 10.0 ccf flows)

Service Charge Per Month
$25.75 per unit
$23.20 per unit
$19.30 per unit


Monthly Service Rate:
Newly established residential accounts are charged a sewer rate of $25.75 per month.

Potable water usage is reviewed each year on December 31. When an account has established a 12-month history, sewer rates are adjusted based on the average of the 3 lowest months of potable water usage during the calendar year.

Customers who use low volumes of water are charged lower sewer rates.

Newport Coast Sewage Collection Fees
A portion of Newport Coast pays $8.40 per month for sewer collection fees.

Septic Tanks:
Customers in certain parts of the IRWD service area are on septic tanks or receive sewer service from another agency and therefore do not pay a sewer charge on their IRWD bill.

Non-Residential Sewer Rates  - (customers who discharge domestic strength wastewater)

Commercial, Industrial & Institutional Class II
Consumption equal to or below an average of 120 ccfs per year:


Service Charge:  $25.75 up to 10 ccfs
Usage over 10ccfs will be charged an additional $2.74/ccf quantity charge 

Commercial, Industrial & Institutional Class II
Consumption in excess of 10ccf per month:


Service Charge:  $25.75 up to 10 ccfs
Usage over 10 ccfs will be charged an additional  $2.74/ccf quantity charge
Industrial Waste charge will be an additional $0.134/ccf quantity charge

Non-Residential Sewage Charges

Non-residential customers who discharge extra-strength sewage into the sewer collection system or discharge or have the potential to discharge constituents subject to federal, state standards or local discharge limitations.

At the sole discretion of the District, users may request the application of an Alternative Service Charge for use.  The Alternative Service Charge shall be based on the measured quantity and quality of water being discharged to the sewer from the user's facility by means acceptable to the District.  The Alternative Serice Charge for use shall be computed bvy the following formula:

Charge for use = VRv + BRb + SRs
Where V = Total volume of clow in hundred cubic feet
B = Total discharge of biochemical oxygen demand (BOD) in pounds
S = Total discharge of suspended solids (SS) in pounds
Rv = $1,570 per hundred cubic feet
Rb = $0.437 per pound of BOD
Rs = $0.381 per pound of SS




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