Welcome to the State Water Resources Control Board Welcome to the California Environmental Protection Agency
Governor's Website Visit the Water Board Members Page
My Water Quality
Performance Report
NPS Encyclopedia

Nonpoint Source (NPS) – Encyclopedia

The NPS Encyclopedia is a free on-line reference guide (guide) designed to facilitate a basic understanding of nonpoint source (NPS) pollution control and to provide quick access to essential information from a variety of sources by providing direct hyperlinks to resources available on the World Wide Web. The purpose of this on-line resource guide is to support the implementation and development of NPS total maximum daily loads and watershed (action) plans with a goal of protecting high-quality waters and restoring impaired waters.

This guide is not directly applicable to any point-source dischargers that are regulated under the Clean Water Act, including activities or facilities that are under a National Pollutant Discharge Elimination System permit (e.g., Municipal Stormwater permit, and confined animal facilities that are Concentrated Animal Feeding Operations).

How To Use This Site

The home page for the NPS Encyclopedia contains a description on how to use the guide, its purpose, and an index of each land use category; applicable and relevant federal, state and local laws, policies and ordinances; and general resources (both technical and financial).

The guide is organized around the six land-use categories:

  1. Agriculture
  2. Forestry
  3. Urban
  4. Marinas and recreational boating
  5. Hydromodification
  6. Wetlands, riparian, and vegetated treatment systems

Each land-use category web page contains an index of relevant management measures, general technical and financial resources, programs, and references. Each management measure web page describes the management measure in detail, lists each relevant management practice, provides specific (technical and financial) resources, and describes relevant programs (if not listed in the overarching land-use category page) and references.

0  NPS Encyclopedia Homepage

1  Agriculture Homepage

2  Forestry Homepage

3  Urban Areas Homepage (newly reorganized)

3.1 Planning and Design

3.2 Construction Practices (includes construction of transportation infrastructure)

3.3 Education and Outreach

4  Marinas and Recreational Boating Homepage

4.1 Marina Siting and Design

4.2 Operations and Maintenance

4.3 Education and Outreach

5  Hydromodification Homepage (newly reorganized)

5.1 Stream Channel Modification

5.2 Managing Hydromodification Impacts

5.3 Education and Outreach

6  Wetlands and Vegetated Treatment Systems Homepage