For Urban Jurisdictions



The Lake Clarity Crediting Program (Crediting Program) motivates effective actions to improve Lake Tahoe clarity by establishing a load reduction accounting system that connects on-the-ground actions to achieving the milestones set by the Lake Tahoe TMDL. The Crediting Program quantifies and tracks pollutant controls implemented to reduce the load of fine sediment particles, nitrogen and phosphorus from urban stormwater and pairs load reduction estimates with roadway and treatment and parcel BMP inspection methods and an internet-based accounting system.


Over the past several years, the standard Crediting Program protocols and tools have been refined to enhance and streamline the user experience and expand tool functionality and compatibility. Updated guidance and tools are available below. A summary of stormwater tool improvements are available in a Project Accomplishment Memo, and a handout from the August 26, 2015 roll out meeting provides an overview of the updated Crediting Program process and an implementation timeline for meeting the first five-year milestone.



Lake Clarity Crediting Program Handbook - Version 2.1

Establishes the annual process Urban Implementers perform to 1) consistently estimate expected load reductions, 2) register or document the pollutant controls and conditions that are expected to result in the estimated load reductions, 3) inspect on-the-ground conditions to verify the conditions used to estimate load reductions are being maintained, and 4) declare the credits to demonstrate compliance with permits and agreements.Version 2.1 corrects typographical and grammatical errors found in Version 2.0. No policy changes were made.


Credit Accounting Platform (CAP)

Comprehensive internet-based accounting system to track and manage Lake Clarity Crediting Program information


Pollutant Load Reduction Model (PLRM) - Version 2.1

A hydrologic and pollutant load generation model that estimates annual average storm water pollutant loads for Tahoe Basin urban lands. The tool is used to quantify pollutant load reductions achieved through implementing pollutant controls and stormwater treatment best management practices (BMPs) at a catchment scale.   


Best Management Practice Rapid Assessment Methodology (BMP RAM) - Version 2.0

Field observation and data management tool to assist Urban Jurisdictions in determining the relative condition of urban stormwater treatment BMPs. Informs users of the relative urgency of water quality maintenance for stormwater treatment BMPs. 

Roadway Rapid Assessment Methodology (Road RAM) - Version 2.0

Field observation and data management tool to assist Urban Jurisdictions in determining the relative condition of impervious road surfaces. Allows the user to rapidly determine and track the relative potential impact to the immediate downslope water quality from roads should a runoff event occur at the time of observation.