Mechanical and plumbing contractors can earn five LEED points for water conservation, 17 points under the energy and atmospheres section and 15 points for indoor environmental quality.

One strategy for water use reduction is to use high-efficiency fixtures, dry fixtures such as composting toilet systems and non-water using urinals, and occupant sensors to reduce the potable water demand. Consider reuse of stormwater and greywater for nonpotable applications such as toilet and urinal flushing and custodial uses.

Another credit is innovative wastewater technologies and the intent is to reduce generation of wastewater and potable water demand, while increasing the local aquifer recharge. Some potential technologies and strategies include specifying a high-efficiency fixtures and dry fixtures such as composting toilet systems and non-water using urinals to reduce wastewater volumes.

Consider reusing stormwater or greywater for sewage conveyance or on-site wastewater treatment systems (mechanical and/or natural). Options for on-site wastewater treatment include packaged biological nutrient removal systems, constructed wetlands, and high-efficiency filtration systems.