Sierra Park Water Company, Inc. (SPWC) is an investor-owned utility that serves drinking water to approximately 350 customers in the Sierra Park community near Long Barn, California. The water source is from two active groundwater wells and six storage tanks.The SPWC owns and operates the community water system under a permit from the State Water Quality Resources Control Board to ensure drinking water quality standards are met and under the jurisdiction of the California Public Utilities Commission (CPUC) as a Small Class D water utility for the regulation of water rates.

For more information about the condition of the water system, please refer to this report: Water System Condition Assessment Report (2016)

September Updates

IMPORTANT UPDATES September 4, 2026

Billing & Customer Service has moved!

Effective September 1, Billing & Customer Service is now being handled by Arizona Utility Billing Solutions, LLC.  Office hours are 10am-2pm Pacific Time.

There are NO CHANGES to the customer portal which is available at this link: https://pay.waterbill.com/login-sierraparkwater

There are NO CHANGES in how you receive your bill – your preferences to receive bills by mail or email can only be changed by you at your request.

There are NO CHANGES for customers who have registered an account online and choose to receive and pay your bills electronically, including enrollment in AutoPay.

PLEASE NOTE THE FOLLOWING CHANGES:

• If you pay by check, you will now send your payment made out to Sierra Park Water Company to: PO Box 3908, Prescott, AZ 86302
• For questions about your bill or your water service, please call (928) 445-5606 or email hello@sierraparkwater.com
• For emergencies after hours only, call (209) 533-7998
• The billing cycle is shifting to the middle of the month for service in the prior month. Your September invoice will be sent in mid-September and will be due and payable upon receipt. Payments not received within 19 days of mailing are subject to incurring late fees.

Now Available: Courtesy Customer Usage Reports for August

A courtesy report of your water usage for the month of August 2026 is now available for your information. Because the integration with the billing system is still underway, the readings on your September billing statement (for August service) will not reflect actual usage.

Alternatively, actual meter reporting data is being made available to you with a courtesy usage report in anticipation of metered billing in the future.

For those customers whose usage exceeds the average of 300 cubic feet, or 3 CCF, courtesy reports are being sent directly.  For all other customers, a courtesy report is available upon request. Send an email to Hello@Sierraparkwater.com with your Account # to receive a courtesy usage report for August.

NOTE: Billing continues at the monthly flat rate until further notice.

If you prefer to read this information offline, you can download it here.

Proposed Increase in Water Rates

Notice of Public Hearing for a Rate Increase.   On August 27, 2026, the California Public Utilities Commission will hold a public meeting on the proposed rate increase. The public meeting is informal and affords customers the opportunity to ask questions and express their views. SPWC will have representatives there to explain the reasons for the proposed increase. Likewise, there will be a CommissionStaff representative who will conduct the meeting and explain how the staff will analyze the proposed rates and fee increases.

On June 19, 2026, Sierra Park Water Company submitted a request to the California Public Utilities Commission to increase its rates for water service. Advice Letter (No. 22-W) seeks authority from the California Public Utilities Commission to increase water rates by $146,605 or 43.86% in Test Year 2026 and by an additional $146,605 or 30.49% in Escalation Year 2027, over present rates, which have been in effect since August 11, 2022. The last General Rate Case became effective in November 2019 with an increase of $100,284 or 55.24%. The increase is necessary to fund needed infrastructure improvements, water system maintenance, business operations, and to adjust for inflation.

The Commission staff will make a thorough investigation of the utility’s request. Following the investigation, the Commission may grant the utility’s request in whole or in part, or may deny it. It may also order the utility to charge rates different from those shown in the Customer notice.

Customer Notice is available here:
Advice Letter 22-W is available here:

Are You a Shareholder?

Be an active part of the Water Company by becoming a Shareholder. As a Shareholder in the water company, you have the right to vote in the annual elections, which includes electing the Board of Directors. As a Shareholder, you are also eligible to run for a seat on the Board of Directors. If you would like to become a shareholder, please fill out this form and return it with $10 as instructed on the form. To be eligible to vote at the Annual Shareholders meeting, requests to purchase stock certificates must be received no later than April 15th for that year’s Annual Meeting, which is held on the Saturday of Memorial Day weekend.