Every three years, Cal Water submits an Infrastructure Improvement Plan to an independent state agency and separate state watchdog, the Public Advocates Office, for review and approval. This process helps to ensure that we are able to continue providing a reliable supply of high-quality water for customers’ everyday needs and sufficient resources for firefighters.
Documents for previous years can be found on the CPUC web site (2012, 2015).

2024 Infrastructure Improvement Plan
- 2024 IIP Application
- 2024 IIP Application Attachment A – Proposed Procedural Schedule
- 2024 IIP Application Attachment B – CWS Proxy and 10-K
- 2024 IIP Application Attachment C – Summary of Earnings
- 2024 IIP Application Attachment D – Proposed Customer Notices
- 2024 IIP Application Attachment E – Current Tariffs
- 2024 IIP Application Attachment F – Proposed Tariffs
2021 Infrastructure Improvement Plan
- 2021 IIP Application
- 2021 IIP Application Attachment A—Proposed Procedural Schedule
- 2021 IIP Application Attachment B—Financial Reports
- 2021 IIP Application Attachment C—Summary of Earnings
- 2021 IIP Application Attachment D—Proposed Customer Notices
- 2021 IIP Application Attachment E—Current Tariffs
- 2021 IIP Application Attachment F—Proposed Tariffs