California Water Boards' Annual Performance Report - Fiscal Year  2017-18 

PLAN AND ASSESS: TOTAL MAXIMUM DAILY LOAD

Water Quality Report Cards

See the regional Water Quality Control Board Offices below.

WHAT THE MEASURE IS SHOWING

Under Section 303(d) of the Clean Water Act, California is required to develop a list of waters that do not meet water quality standards. This list is commonly referred to as the 303(d) list. The Clean Water Act further requires development of action plans, called Total Maximum Daily Loads (TMDL) to restore water quality. As of July 1, 2018, the Water Boards have adopted 222 TMDL projects addressing 1,676 impaired waterbody listings. In California, TMDLs are incorporated into Regional Water Quality Control Plans (Basin Plans), and include a program of implementation to ensure actions are put in place to reduce pollutant sources and ultimately resolve water quality problems. In effect, TMDL projects are performance based water quality management plans. TMDL implementation schedules can range from years to decades depending on the type of pollution, the complexity of the TMDL, and the physical setting of the waterbody being addressed. Each TMDL project has a unique implementation program, a unique schedule, and usually unique challenges, therefore the water quality outcomes vary.

The Water Quality Report Cards presented above present the implementation status and/or water quality outcomes resulting from implementation of projects addressing 303(d) listed waterbodies. The Water Quality Report Cards assess the water quality outcomes associated with either the implementation of adopted TMDL Projects or the implementation of other Regional Boards projects that have addressed 303(d) listed waterbodies.

WHY THIS MEASURE IS IMPORTANT

Adoption of TMDL projects can be a resource intensive and a time consuming process. Once adopted, TMDL projects must be implemented to provide water quality improvement. As indicated above, TMDLs are generally incorporated into Regional Basin Plans, which in turn require development of a program of implementation for achieving the TMDL, including a description of the nature of actions that are necessary to achieve water quality objectives, time schedules for the actions to be taken, and a description of surveillance to be undertaken to determine compliance with objectives. This measure tracks TDML implementation progress, and shows how TMDL implementation actions affect water quality.

TECHNICAL CONSIDERATIONS

• Data Source: California Total Maximum Daily Load (TMDL) Program Status Summary Report Fiscal Year 17-18
• Data Definitions: TMDL Project: A TMDL project is a planned strategy to reduce pollution in an impaired waterbody so that its water quality standards are met. A TMDL project may address more than one or more waterbody-pollutant combinations for a given waterbody or segment of waterbody (known as 303(d) listings). A TMDL project includes the development of the TMDL, and TMDL implementation plan, or a USEPA approved alternatives to TMDLs, category 4b projects. A TMDL is comprised of a calculation of the maximum amount of a pollutant that the waterbody can receive and still meet water quality standards (i.e., waterbody's assimilative capacity); an allocation of acceptable pollutant loading to the various sources of the pollutant; and in California, an implementation plan for restoring water quality. A category 4b project is an alternative approach that implements pollution control requirements (e.g., best management practices) that is stringent enough to implement applicable water quality standards within a reasonable period of time. 303(d) Listing: A 303(d) listings is a waterbody-pollutant combination that is responsible for the impairment as specified on the Water Boards' Clean Water Act Section 303(d) List of Impaired Waterbodies (i.e., each waterbody-pollutant combination is called a listing). If a single waterbody is impaired by multiple pollutants, the waterbody will have multiple listings, one for each pollutant. The geographic extent of a listing may vary from a small segment of a stream to an entire watershed. The current TMDL projects and listings are documented in the Water Boards' 2010 Clean Water Act Section 303(d) List of Impaired Waterbodies.
• References: Information on the Water Boards' TMDL activitiesBeneficial Use Definitions

GLOSSARY

Attainment Date

The projected year water quality targets will be achieved. The attainment date is estimated based on available information at the time of the most recent update to the water quality restoration plan. The attainment date is subject to change.

Beneficial Uses

Beneficial uses define the uses of water. The California Water Code defines beneficial uses of the waters of the state as uses that may be protected against quality degradation include, but are not limited to: domestic, municipal, agricultural and industrial supply; power generation; recreation; aesthetic enjoyment; navigation; and preservation and enhancement of fish, wildlife, and other aquatic resources or preserves.

Effective Date

The date upon which the TMDL or other implementation action (e.g., Cleanup and Abatement Order) is considered to take effect.

Implementation Outcome Status Assessed

A water quality report card has been prepared showing the outcome of implementing water quality restoration plans (TMDLs or other approach) that have already been adopted. It is important to note that Regional Boards may be implementing water quality restoration plans (e.g., incorporating TMDL requirements into permits, reviewing water quality data, etc.) for projects for which a Water Quality Improvement Report Card has not yet been created.

Pollutant

A pollutant is a waste or substance that, at certain levels, can cause waterbody impairment. The monitoring programs of the Water Boards and others provide information on the levels of pollutants in the State's waters.

Pollutant Types

Point Source Pollutant

Pollutants that are, or may be, discharged from any discernible, confined, and discrete conveyance, including but not limited to any pipe, ditch, channel, tunnel, conduit, well, discrete fissure, container, rolling stock, concentrated animal feeding operation, or vessel or other floating craft.

Nonpoint Source (NPS) Pollutant

Pollutants that are or may be discharged from diffuse sources without a single identifiable point of origin. These discharges include, but are not limited to, runoff from agriculture, forestry, grazing, hydromodification, wetlands, and marinas and recreational boating activities.

Legacy Pollutant

Pollutants that are primarily the result of historical contributions. They result from activities such as agricultural, manufacturing, and mining activities no longer practiced and include some pollutants currently banned by regulation. These pollutants have the common characteristic of persistence in the environment and may have an affinity for sediments. Typically, the decline in environmental legacy pollutant concentrations occurs as a result of natural attenuation processes.

Water Quality Objective

The limit or level of water quality constituents or characteristics which are established for the reasonable protection of beneficial uses of water or the prevention of nuisance within a specific area.

Water Quality Target

The water quality target is a description of the desired condition in the watershed or waterbody. Typically, targets are tied to specific water quality standards that provide measurable goals for the water quality restoration plan.

STATUS DEFINITIONS

Conditions Improving

Water quality data and/or other indicators demonstrate improvement; BUT
The final water quality targets not consistently being met.

Data Inconclusive

Not enough data (of acceptable quality) has been collected to demonstrate that the water quality targets are consistently met; OR
Variability in data do not permit a determination in water quality trends (positive or negative).

Improvement Needed

Final water quality targets not consistently met; AND
In Water Board staff judgment, water quality data and/or other indicators demonstrate that water quality is either declining or not improving.

Targets Achieved/ Waterbody Delisted

Water quality data or other information demonstrate that final water quality targets are consistently met; OR
The waterbody has been removed from the 303(d) list.