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CA0710003

Contra Costa Water District

Concord · CONTRA COSTA County · Potable Water · Retail

Real loss per connection per day (2024)

47.2gallons

Higher than 73% of California systems

Real loss as % of water supplied

10.8%

Total loss 12.4% · apparent 1.7%

Change vs prior year

+14.2gal/conn/day

Loss rising

Real loss volume, latest audit

1.08B gal

3,302 AF · 62,253 connections

Loss history

9 audit years available (2016–2024).

Teal area: real loss in gallons per service connection per day. Orange line: real loss as a percentage of water supplied. Gaps mean the metric was not calculable for that audit.

Peer comparison

This system

47.2gal/conn/day

CONTRA COSTA County median

38.9gal/conn/day

Statewide median

26.8gal/conn/day

Audit record

YearPeriodSuppliedReal lossgal/conn/daygal/mile/dayReal %Total %ILIValidityStatus
20242024-01-01 → 2024-12-3130,697 AF3,302 AF47.23,61010.8%12.4%2.9559Under Review
20232023-01-01 → 2023-12-3128,688 AF2,321 AF33.12,5478.1%9.8%2.0755Preliminarily Approved
20222022-01-01 → 2022-12-3130,483 AF1,958 AF27.72,1556.4%8.2%1.7459Under Review
20212021-01-01 → 2021-12-3131,328 AF1,754 AF24.81,9315.6%7.3%1.5567Requirements Addressed
20202020-01-01 → 2020-12-3133,172 AF2,336 AF33.02,5657.0%8.7%2.0667Requirements Addressed
20192019-01-01 → 2019-12-3130,466 AF2,030 AF28.82,2136.7%8.3%1.7967Requirements Addressed
20182018-01-01 → 2018-12-3130,587 AF1,823 AF25.81,9876.0%7.6%1.6166Requirements Addressed
20172017-01-01 → 2017-12-3129,737 AF1,726 AF24.51,8825.8%7.5%1.5266Requirements Addressed
20162016-01-01 → 2016-12-3127,389 AF1,748 AF25.31,9076.4%8.2%1.5763Requirements Addressed

Data quality notes

No integrity flags were raised on this system's audits.

Provenance

Audit data
CA Urban Retail Water System Water Loss Annual Loss Audit Data (DWR)
Volume normalization
Source acre-feet and million-gallon values converted at 1 acre-foot = 325,851 gallons
Geography
California SABL drinking-water service areas + EPA ORD SAB Model service-area polygon (PWSID)
Geography match
pwsid_exact_service_area · high confidence
Audits published
9
Full method and caveats