These calculations assume that water is heated with electricity  
Conservation Activity Assumptions used in calculations Relevant references
Cost of water Water on TAP - EPA document, $2/1000 gallons http://water.epa.gov/drink/guide/upload/book_waterontap_full.pdf
Cost of electricity Current average cost of electricity $0.08/kWh http://www.uml.edu/emsc/guidebook_si_energymanagement.pdf
Electricity to heat water Saving water and saving energy , 0.2 kWh/gallon http://www.bae.ncsu.edu/programs/extension/publicat/wqwm/he251.html
Bathroom Water Use    
Turn off water while brushing teeth 4 gal/min faucet, 1-minute brushing, twice a day with cold water http://www.fypower.org/res/tools/products_results.html?id=100160
Shorten shower by 2 minutes 5 gal/min shower head, 2-minute reduction of hot water http://www.fypower.org/res/tools/products_results.html?id=100160
Use water-efficient toilet  4 gal/flush in regular toilet vs 2 gal/flush in efficient toilet, 5 flush per day per person, cold water http://www.swfwmd.state.fl.us/publications/files/daily_water_use.pdf
Use low-flow shower head Reduction of 2.5 gal/min for 4 minutes per person, hot water http://www.energysavers.gov/your_home/water_heating/index.cfm/mytopic=13050
General Water Use    
Run dishwasher only when full A dishwasher load uses 6 gallons of water - eliminating one load saves 6 gal/2 days, hot water, 0.5 kwH saved/day http://practicallygreen.com/run-dishwasher-only-when-its-full
Turn off water between rinsing dishes Savings of 1 minute at 5 gal/min, cold water
Fix a leaking faucet 1 drip per second, cold water, 10 gallons/day http://www.epa.gov/WaterSense/water_efficiency/what_you_can_do.html#fix
Change heater from Hot to Medium Reduction of 20F with 8% savings in energy, 15 gal/person/day  hot water, $ gal/day for rinsing etc http://www.energysavers.gov/your_home/water_heating/index.cfm/mytopic=13090
Wash only full loads of laundry Assumed reduction of one load per week, 42 gal/week, 6 gal/day, hot water, 1kWh per week, 0.16 kWh/day http://www.laundrywise.com/downloads/Water_Energy%20Survey.pdf
Reduce lawn watering by 1 inch monthly  0.25-acre lawn area, 225 gal/day, for 6 months  
Electricity Use    
Winter - Set thermostat at 58F for 8 h daily 10% reduction in use of electricity for heating, 350 kWh/year http://www.eia.gov/emeu/reps/enduse/er01_us_tab1.html
Sumer - Set thermostat at 80F for 8 h daily 10% reduction in use of electricity for cooling, 280 kWh/year http://www.eia.gov/emeu/reps/enduse/er01_us_tab1.html
Use LED light bulbs LED lights use 10% of the electricity used by incandescent light bulbs; average use of 940 kWh/year http://eartheasy.com/live_led_bulbs_comparison.html
Use compact fluorescent light bulbs CFL lights use 25% of the electricity used by incandescent light bulbs; average use of 940 kWh/year http://eartheasy.com/live_led_bulbs_comparison.html
Turn lights off when not in use 25% savings of electricity; average used of 940 kWh/year http://www.eia.gov/emeu/reps/enduse/er01_us_tab1.html
Gasoline Use    
Reduce car travel by 50 miles/month Reduction in gasoline used based on gas mileage  
Keep tires properly inflated 2% improvement in gas mileage http://www.fueleconomy.gov/feg/maintain.shtml
Avoid rapid acceleration and braking in town 5% reduction in gas mileage with rapid acceleration and braking in town; 30% of yearly mileage driven in town http://www.fueleconomy.gov/feg/driveHabits.shtml
Avoid rapid acceleration and braking in highways 30% reduction in gas mileage with rapid acceleration and braking on highways; 70% of yearly mileage driven in town http://www.fueleconomy.gov/feg/driveHabits.shtml
Drive at 60 mph instead of 75 mph 20% reduction in gas mileage with rapid acceleration and braking on highways; 70% of yearly mileage driven in town http://www.fueleconomy.gov/feg/driveHabits.shtml
Food Consumption    
Buy local food Reduction in 0.36 metric ton CO2/year; 793 lb CO2/y Env. Sci. & Technol. 42:3508-3513.
Shift one day a week from red meat to chicken/fish/eggs Reduction in 0.27 metric ton CO2/year; 603 lb CO2/yr Env. Sci. & Technol. 42:3508-3513.
Shift one day a week from red meat to vegetables Reduction in 0.41 metric ton CO2/year; 920 lb CO2/yr Env. Sci. & Technol. 42:3508-3513.