Potable reuse of treated wastewater behind multi-barrier treatment and long acceptance-building
#00185
Purify treated wastewater through an advanced multi-barrier train (ultrafiltration, RO, UV/AOP) and return it to drinking supply via aquifer recharge, reservoir blending, or direct injection. Proven since Windhoek's 1968 launch; the binding constraint is public acceptance, not en
El Paso, Texas, USA
OngoingEl Paso Water · since 2025 · City
El Paso Water broke ground on the Pure Water Center on 27 February 2025: the first US municipal direct-to-distribution potable reuse plant, sending 10 MGD of purified water straight into the distribution network with no…
$295M · El Paso Water
San Diego, California, USA
PartialCity of San Diego Public Utilities (Pure Water San Diego) · since 1999 · City
San Diego's 1990s water repurification project was killed in 1999 by 'toilet to tap' talk-radio framing after failing to secure public acceptance. From ~2011, the city rebuilt the case using a demonstration facility, th…
$1.7B · City funds plus federal WIFIA loan ($614M) within a ~$1.7bn+ Phase 1
Toowoomba City Council (Water Futures proposal) · since 2006 · City
At the height of the Millennium Drought, Toowoomba City Council's Water Futures proposal would have added indirect potable reuse supplying ~25% of the city's water for ~A$68M. The council put it to a referendum on 29 Ju…
A$68M · 1 source
Water Corporation of Western Australia · since 2017 · Region
Perth's Groundwater Replenishment Scheme at Beenyup recharges advanced-treated wastewater into deep aquifers for later drinking-water abstraction, the Southern Hemisphere's first such scheme. Capacity was doubled to 28…
Water Corporation / WA state; stage 2 expansion ~A$262-320M · 2 sources
Singapore
SuccessPUB, Singapore's National Water Agency · since 2003 · National
NEWater, launched in 2003, is Singapore's branded high-grade reclaimed water produced through microfiltration, reverse osmosis, and UV disinfection. Five plants meet up to 40% of national demand, routed primarily to ind…
Government of Singapore / PUB · 1 source
Orange County Water District and Orange County Sanitation District · since 2008 · Region
The Groundwater Replenishment System (GWRS) in Orange County purifies secondary-treated wastewater through a multi-barrier train (microfiltration, reverse osmosis, UV/AOP) and injects it into the local groundwater basin…
$900M · Layered federal and state financing plus district funds · 1 source
Windhoek, Namibia
SuccessCity of Windhoek / Windhoek Goreangab Operating Company · since 1968 · City
Windhoek pioneered direct potable reuse in 1968, making it the world's first city to return purified wastewater directly to its drinking supply. The New Goreangab plant (2002) produces about 21,000 m³/day, supplying rou…
City of Windhoek; DPR II expansion backed by KfW (~$43M)