See below for installers of in-house plumbing.
See landscapers familiar with greywater harvesting to do the planting, earthworks, and plumbing in the yard.

AUSTRALIA

Check out Green Plumbers for references for green plumbers familiar with greywater harvesting systems.
http://www.greenplumbers.com.au/

Ask the plumbers, and the trainers of the plumbers, if they have experience with gravity-fed greywater stub-outs and greywater systems such as Art Ludwig’s “branched drain greywater systems” or the “multi-pipe” laundry drains I feature in my books. I find these gravity-fed systems to be the most efficient, trouble-free, and economical systems. Nonetheless, the more complex, trouble-prone, and less efficient tank and pump systems are what are pushed by many codes and industry wanting to sell more product – that’s why I recommend you ask.

UNITED STATES (nationwide)

Check out Green Plumbers USA for references for green plumbers familiar with greywater-harvesting systems.
http://www.greenplumbersusa.com/

Ask the plumbers, and the trainers of the plumbers, if they have experience with gravity-fed greywater stubouts and greywater systems such as Art Ludwig’s “branched drain greywater systems” or the “multi-pipe” laundry drains I feature in my books. I find these gravity-fed systems to be the most efficient, trouble-free, and economical systems. Nonetheless, the more complex, trouble-prone, and less efficient tank and pump systems are what are pushed by many codes and industry wanting to sell more product – that’s why I recommend you ask.

Rain Catchers
This company, based out of North Carolina, offers matrix, rain & greywater harvesting systems that can take you from irrigation all the way to tap water. Services available nationwide.
www.rain-catchers.net

Arizona

Cottonwood, Cornville, and Sedona

Tom Crawford of Arrow Plumbing
Tom can do your collection plumbing within or under the house, then Eden on Earth Landscaping can connect Tom’s work to mulched basins within the landscape.
928 634-4003

Flagstaff

Mountain High Plumbing
Mountain High Plumbing can do your the collection plumbing within or under the house, then Eden on Earth Landscaping can connect the plumbing work to mulched basins within the landscape.
928 774-3593

Prescott

Macrae Nicoll of High Desert Rainwater Harvesting
www.HighDesertRain.com

Santa Cruz county

Paul “Chip” Fieberg
hearightnow@gmail.com

Tucson

Clay Brown
Indoor and outdoor plumbing work.
520 331-5656

Desert Sky Home Repair, LLC
520 622-0607

Guy Cloutier
Guy is an all-around handyman, but very busy so book him early.
520 991-4930

Phoenix

Chip Satterlund of Chipit Handyman Services
Chipsatt@permaculture.net

California

WhollyH2O
A clearinghouse-in-progress of all California service providers and California (and beyond) products for rainwater, greywater, storm water and black water for the residential, commercial, industrial, institutional and agricultural sectors. This includes xeriscaping and water-focused landscaping products and service providers.
www.whollyh2o.org

Oakland

Greywater Action, formerly known as Greywater Guerrillas
greywateraction.org

San Diego

H2OME
www.h2o-me.com

Monty’s Plumbing
www.montysplumbing.com

Santa Barbara

Wilson Environmental Landscape Design
www.WELDesign.net

Sonoma County

AP Rainwater Harvesting and Greywater Harvesting Solutions
www.aprainwaterharvesting.com

New Mexico

Santa Fe

San Isidro Permaculture
sanisidroperm@hotmail.com

The RainCatcher Incorporated
www.theraincatcher.com

Ecoscapes Landscaping
www.ecoscapesnm.com

North Carolina

Asheville

A to Z Plumbing Contractors, Inc.
www.eatsleepplumb.com