WESTWeb uses streamlined life-cycle thinking to quantify water and wastewater systems' energy use and environmental effects, including greenhouse gases. WESTWeb was developed at the University of California at Berkeley with funding from the California Energy Commission.

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1) On the Tool tab, scroll over items underlined in red for brief guidance.

2) For a detailed WESTWeb info, see Background.

3) For frequently asked questions about WESTWeb, see FAQs.

4) For more on the life-cycle assessment (LCA) methodology, see LCA.

5) For a more complete LCA tool for water/wastewater, see WEST model.

6) If necessary, contact the developers. Note: customer service for this tool is not guaranteed.


Site launch:
May 31, 2011

Last update:
July 18, 2011

Update log

WEST Web  

Modeling Parameters

Select system type:  
Units selection:  
Enter number of scenarios:  
Functional Unit:   (gallons)

Annual Water or Wastewater Production

Enter scenario production volume (in gallons):

Scenario # Scenario Name Annual Scenario Production


Pipe Length and Material

Would you like to enter detailed data about pipe materials?  

Enter total length (in feet):

  Scenario #1
Scenario #2

Reinforced Concrete Materials

Would you like to enter detailed data about buildings and pre-cast structures?  

Enter total volume of reinforced concrete (in cubic yards):

Scenario #1
(cubic yards)
Scenario #2
(cubic yards)
Pre-treatment  Supply
Treatment  Treatment
Post-treatment  Distribution

Process Equipment

Would you like to enter detailed data about process equipment?  


Electricity Mix

Electricity Mix Location:  

Enter percentages for each scenario's electricity primary fuel/energy source:

  US Mix
Coal 49.61%
Oil 3.73%
Natural Gas 18.77%
Nuclear 19.28%
Hydro 6.5%
Biomass 1.3%
Wind 0.44%
Solar 0.01%
Geothermal 0.36%
Total 100%

Energy Use

Enter quantities of energy consumed for each scenario:

Annual Consumption of: Pre-treatment Treatment Post-treatment Pre-treatment Treatment Post-treatment
Scenario 1 Scenario 2
Electricity (MWh)
Natural Gas (MMBTU)
Gasoline (gallons)
Diesel (gallons)

Treatment Chemical Consumption

Enter quantities of chemicals used in each scenario:

  Units Scenario #1 Scenario #2
pH Adjustment      
Hydrochloric Acid lb/yr
Sulphuric Acid lb/yr
Lime lb/yr
Coagulants & Flocculants      
Aluminum Sulfate lb/yr
Aluminum Hydroxide lb/yr
Caustic Soda lb/yr
Ferric Chloride lb/yr
Polymers lb/yr
Chlorine lb/yr
Calcium Hypochlorite lb/yr
Ozone lb/yr
Aqueous Ammonia lb/yr
Fluorosilicic Acid lb/yr
Other Chemicals $/yr

Run Analysis

Results are provided per functional unit specified in the Modeling Parameters section. Results include: greenhouse gases (in CO2 equivalents), energy, carcinogens (chloroethylene [C2H3Cl] equivalents), non-carcinogens (C2H3Cl equivalents), respiratory inorganics (PM2.5 equivalents), ozone depletion (CFC-11 equivalents), respiratory organics (ethylene [C2H4] equivalents), aquatic ecotoxicity (triethylene glycol [TEG] water), terrestrial ecotoxicity (TEG soil), aquatic acidification (SO2 equivalents), and aquatic eutrophication (PO43- in a P-limited environment). For more info on the impact categories listed here, see the Glossary.

Display detailed calculations: Analysis output notation