Water Knowledge


Residential Fire Sprinkler Systems Report

Residential fire sprinkler systems (RFSS) help save lives and their use is growing. 

This guidance document provides information to help utilities better understand the features of RFSS and set policies and procedures for serving customers with RFSS to ensure that hydraulic and water quality requirements are met at a reasonable cost and without revenue loss.

Download the report (1 MB, PDF)

Resources on Lead

AWWA's first edition standard on replacement and flushing of lead service lines has been published. 

ANSI/AWWA C810-17 Replacement and Flushing of Lead Service Lines provides guidance for water utilities that are currently undertaking or contemplating replacement of lead service lines.

Additional Resources

Flange Torque Calculator

This online interactive tool can be used in conjunction with AWWA’s Manual M11 to determine the recommended torque ranges and other important flange details, gasket stresses, and bolt yield loads.



Corrosivity Calculations

Lab bottles

Estimate the corrosivity of a water sample using the Langelier Saturation Index (LSI) and the Ryznar Stability Index (RSI) using this spreadsheet tool from the AWWA WaterMATH Quick Calculator for Water Operators CD:

WaterMATH Corrosivity Estimators (XLS)

For more precise estimates, try the Tetra Tech (RTW) Model for Water Process & Corrosion Chemistry

Hypochlorite Assessment Model

Storage tanks

To support our utility members, AWWA has developed a web-based predictive modeling tool (Copyright 2011 AWWA) intended to provide member users with approximate guidance on the degradation of hypochlorite and levels of selected degradation byproducts at their sites.