OCWD and OCSD's Groundwater Replenishment System purifies treated wastewater via microfiltration, reverse osmosis and UV/advanced oxidation, producing 130 million gallons/day for about …
Since 2005, Virginia's nutrient exchange lets dischargers trade nitrogen/phosphorus credits to meet Chesapeake Bay TMDL limits; in 2020 alone 316,330 lb N …
Richmond, United States of America
Good practice
Evidence: Observational / pre–post
Top 58%40/100
Washington, D.C.'s stormwater credit market lets developers buy tradeable credits from landowners who install green infrastructure, meeting part of their runoff-retention rules …
Washington, D.C., United States of America
Good practice
Evidence: Observational / pre–post
Top 58%40/100
A $200,000 Coca-Cola Foundation grant funded a 6.6-mile fence protecting 1,400 acres of native Koʻolau forest on Oʻahu from invasive species, safeguarding …
Since 2001 MMSD has paid willing landowners for wetlands and floodplain with water-absorbing soils; ~6,100 acres are protected, estimated to hold ~3.3 …
Maryland pays farmers a per-acre incentive purely to plant winter cover crops for nutrient-runoff control — the largest, longest-running state cost-share program …
A NASA-USGS-EDF consortium turns Landsat/ECOSTRESS satellite data into free field-level irrigation-use estimates; since 2023 California's Delta water agencies use it instead of …
Sacramento, United States of America
Good practice
Evidence: Observational / pre–post
Top 76%33/100
A NOAA-, state- and fishery-funded programme removed nearly 50,000 lbs of purple sea urchins from Sonoma-Mendocino reefs, cutting densities below the 2-per-square-metre …
Point Arena, United States of America
Good practice
Evidence: Descriptive / self-reported
Top 76%33/100
Since 2017, California's CDFA has issued $105M+ in grants for 1,500+ farm projects using compost, cover crops and reduced tillage. Modelled reductions …
Sacramento, United States of America
Good practice
Evidence: Observational / pre–post
Top 76%33/100
A 2011 aerial rat eradication on Palmyra Atoll (Island Conservation/TNC/USFWS) preceded a peer-reviewed study showing native tree seedlings rose from under 150 …
A cluster randomised trial of 541 Philadelphia vacant lots (cleaned-and-greened vs. trash clean-up vs. untouched) found reduced gun violence and burglary nearby …
During a severe drought Wichita Falls ran an emergency direct potable reuse system from July 2014 to July 2015, achieving 9.2/12.3/9.3-log virus/Giardia/Crypto …