CCC Plan Revision and Water Loss Audit Validation
City of Eureka
City water system serving more than 27,000 people on Humboldt Bay
Exodus revised Eureka’s Cross-Connection Control Plan through final submittal and validated its water loss audit.
Water infrastructure management
Water Loss Audits for California Systems: SB 555 & AWWA M36
A validated AWWA M36 water loss audit with DWR submittal support, filed on the annual SB 555 cycle.
SB 555 audit filing: Annual, every January 1
Free tool
Water Loss Calculator
Turn your supplied volume and loss estimate into gallons lost per year and per day.
Estimated real losses
- gallons lost per year
- 0
- gallons lost per day
- 0
- acre-feet lost per year
- 0
- per year at the cost you entered
- $0
Enter your supplied volume to see your estimate.
An AWWA M36 audit gives you the validated figure, graded for data validity and separated into real and apparent losses.
Built to California's frameworks
- California CCCPH
- Title 17 CCR: Backflow Protection
- Title 22: Drinking Water Standards
- SB 555 · AWWA M36
- DDW & DWR Submittals
Certifications & Registrations
The audit
What a water loss audit is
A water loss audit is a data-driven assessment of your water balance. It quantifies all water entering your distribution system, accounts for every authorized use, and identifies the volume lost to leaks, metering errors, unauthorized use, and other factors. The AWWA M36 manual, Water Audits and Loss Control Programs, is the industry-standard method, and the one California's SB 555 framework is built on.
The result is more than a compliance filing. It is performance data on real vs. apparent losses, infrastructure leakage, and the revenue your system is leaving uncollected.
The method
How we deliver your audit
1. Data collection and water balance
We assemble your supply, production, billing, and authorized-consumption data and build the system water balance, the foundation of every AWWA M36 audit.
2. Real vs. apparent loss analysis
Losses are separated into real losses (leaks, breaks, overflows) and apparent losses (meter inaccuracy, unauthorized use, billing and data errors), so each problem gets the right fix.
3. Data validity grading
Each input is graded for reliability. The data validity score shows regulators and your board how much confidence the numbers deserve, and where to improve them.
4. Validation and DWR submittal support
Completed audits are prepared for validation and submittal to the Department of Water Resources, meeting the annual SB 555 reporting requirement for urban water suppliers.
5. Loss-control recommendations
You receive a prioritized corrective-action roadmap: metering improvements, leak detection priorities, and pressure or data practices that reduce non-revenue water year over year.
FAQ
Questions about water loss audits
Who has to file a water loss audit in California?
Under SB 555, urban water suppliers must conduct a validated water loss audit using AWWA M36 methodology and submit it to the Department of Water Resources each year. The audit also feeds the water loss standard in your Urban Water Management Plan.
What is the difference between real and apparent losses?
Real losses are physical water lost through leaks, breaks, and overflows. Apparent losses are water that is consumed but not correctly measured or billed: meter inaccuracies, unauthorized consumption, and data handling errors. Together they make up non-revenue water.
Can Exodus support smaller systems too?
Yes. Even where a validated audit is not yet mandated, the same M36 water-balance method helps small systems find revenue losses and prioritize leak repair, and prepares you for tightening requirements.
Get this year's audit handled
Tell us your system size and last audit status. We will scope a validated M36 audit and submittal timeline.