Welcome to MRWA’s Water Tools! Simply click on a calculator you would like to use, enter your numbers and get the result. 

A Note About Browsers: If you find that a calculator is not providing you with immediate results, try clearing your browser cache or simply close the calculator and reopen it. As well, if you use Internet Explorer, you may need to click the Compatiblity View button.

Water Loss Tracking Tools

Circular Break Around Pipe

Hole In Pipe

Rectangular Break Along Pipe

Special Calculators

Monthly Water Loss

Sizing A Chemical Feed Pump

Annual Water Loss Average

Hydrant or Pipe Flush Flow Calculator

Well Drawdown and
Specific Capacity Calculator

Solution Strength Mix Calculation

Percent Efficiency Calculator

NPDES Permit
Design Flow Exceedence

Disinfection Formula Calculators

Pipe Disinfection Formula

Tank Disinfection Formula

Well Casing Disinfection Formula

Wastewater Infiltration Calculators

Wastewater Inflow Calculator

Wastewater Infiltration
Calculator – Circular Break

Wastewater Infiltration
Calculator – Circular Hole

Wastewater Infiltration
Calculator – Rectanglar Break

Certification Eligibility Calculator