More complex systems including large storage capacity or underground tanks have a larger price tag attached. Maximizing RWH potential in an existing or new home or multi-unit building by integrating stormwater capture and graywater reuse will increase project costs. But the environmental and health benefits and personal satisfaction derived from using a RWH system provide real value, which must not be left out of the calculation. Costs for a typical residential RWH system with above-ground storage generally run from $2-5 per gallon of capacity for irrigation use and $5-8 per gallon for toilet and laundry use. Larger tanks result in slightly lower per gallon costs.
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