Water Rates

Treated Water

Commercial and any other users that have the facilities to accept treated water within the service boundary of the District. Commercial users within the WHWD service boundary are non-residential users that have the facilities to accept treated water. Examples of these are: Diablo Grande Homeowners Association, Diablo Grande Clubhouse and the Diablo Grande Fire Station.

The WHWD pricing system is made up of two elements: a fixed monthly service charge and a volume charge. The fixed monthly charge is collected whether the customer uses water or not during the period billed. The fixed monthly charges exclude any water use. The usage charge for Residential service is $10.31 per 1,000 gallons

Rates are as follows:
Base Rate: 
Fiscal Year ending June 30, 2027 (Effective September Billing Cycle)
$354.00 base rate + $10.31 per 1,000 gallons used

No Base Rate
Applied Commercial Tiered Rates – Restated
$8.91 per 1,000 gallons used
WHWD encourages practicing water conservation regardless if raw or treated.

Sewer Rates
The WHWD has an agreement with the City of Patterson to treat and dispose of wastewater generated within the service boundary of the District. This agreement requires the WHWD to pay 1.5 times the City of Patterson’s standard residential sewer fee. The City of Patterson currently charges $66.84 per month to city residents. Currently WHWD is collecting $55.97 per month per homeowner. This charge is currently being collected on the homeowner’s property tax bill:
Please refer to the City of Patterson website for sewer charge details.

Please Note
As of July 2025 the City of Patterson is going through a sewer rate study. WHWD is in the process of negotiating a new sewer contract with Patterson. Although these negotiations are attorney/client confidential, a settlement agreement is circulating please refer to:
City of Patterson vs. Western Hills Water District