Posted on August 2, 2018 by Ridgway Hall
The Chesapeake Bay watershed covers 64,000 square miles in parts of Maryland, Virginia, Pennsylvania, Delaware, New York, West Virginia and the District of Columbia. When the six states and the District asked EPA to establish a multi-state Total Maximum Daily Load under the Clean Water Act in 2010 and assign each state its fair share, they took on the job of reducing discharges of nitrogen from all sources by 25%, phosphorus by 24% and sediment by 10%. The goal is to have all necessary measures in place to achieve this by 2025 to meet applicable water quality standards. With funding at the state and federal levels in short supply, a search was on for the most cost-effective ways to reduce these pollutants. The states with the biggest burdens, Pennsylvania, Virginia and Maryland, each turned to the emerging practice of water quality trading.
Trading enables a discharger for whom the cost per unit of pollution reduction is lower than for other dischargers to reduce its pollution below what the law requires and sell that extra reduction as a “credit” to another discharger for whom the cost per unit of pollutant reduction is greater. The result is that the seller makes money from the credit sale, and the buyer attains compliance at a lower cost than it would otherwise incur. Sounds simple, doesn’t it? In October the Government Accounting Office published the results of a nationwide survey in which it found that only 11 states have water quality trading programs, and the only significant use being made was in Pennsylvania, Virginia and Connecticut, even though EPA has been promoting it since 1996. (I discussed this in “Water Quality: Wading into Trading” posted Nov. 28, 2017).
To encourage the Bay states to adopt trading programs that will comply with the Clean Water Act and its implementing regulations, EPA published a series of “Technical Memoranda” (TMs) addressing key elements of a trading program including “baseline” (the maximum amount of pollution allowed under any applicable law before a credit can be generated), protecting local water quality where a credit is used, credit calculation, and accounting for uncertainty. This is needed where a nonpoint source, like a farm, is generating credits by installation of best management practices (BMPs) and the pollution reduction benefits must be estimated using modeling. The TMs also address credit duration, certification by the agency, registration and tracking on a publicly posted registry, and verification that the BMPs on which the credits are based are being maintained. Finally, they address sampling and public participation. (See my blog post of Sept. 26, 2016 “New Tools for Water Quality Trading”). Credits can also be used to “offset” new or expanded discharges. The TMs are not regulations, but set forth EPA’s “expectations”.
Pennsylvania, Virginia and Maryland have adopted trading regulations which are intended to be consistent with the TMs. The principal elements include . . . [CLICK HERE TO READ THE REST OF THIS ARTICLE]
Tags: Chesapeake Bay, Nutrient trading, Total Maximum Daily Load (TMDL), State water quality planning
Clean Water Act | Environmental Protection Agency | Permitting | States | Stormwater | Trading | Water Quality Standards