Hosted/Impaired_Catchments (FeatureServer)

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MaxRecordCount: 2000

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Layers:

Description: This feature layer contains polygons of the catchment, or area that drains to the water body, that contains waterbody segments where water quality objectives are not being attained. The waterbodies in these catchments are listed under section 303(d) of the Clean Water Act as impaired due to a pollutant. Aluminum Aluminum is a naturally occurring element and is the most common in the earth’s crust. Aluminum is considered non-essential to aquatic life since they do not need it to function. However, elevated levels of aluminum can affect some species ability to regulate ions which can affect essential functions like breathing and can lead to death in fish species. Arsenic Arsenic is a naturally occurring semi-metallic chemical that has been linked to several cancers. These include bladder, lungs, skin, kidney, nasal passages, liver, and prostate. Non-carcinogenic effects of arsenic include skin lesions, cardiovascular disease, and cognitive impairment. Benthic Community Effects Benthic macroinvertebrates include aquatic insect larvae, crustaceans, mollusks, and worms that live at the bottom of rivers and streams. Because they are ubiquitous, relatively stationary, and diverse, assessing types and numbers provides a range of responses to environmental pressures. Biological populations and/or communities are compared to reference sites and may exhibit degradation due to water quality or sediment concentrations. Water quality pollutants include chemical concentrations, temperature, dissolved oxygen, and trash. Dissolved Oxygen Dissolved oxygen is the amount of oxygen that is present in water. Bodies of water receive dissolved oxygen from the atmosphere and aquatic plants. Faster waters typically hold more dissolved oxygen than still waters like a pond. Dissolved oxygen levels must meet a certain threshold for aquatic organisms to survive. Indicator Bacteria Indicator bacteria are used to measure the potential presence of fecal material and associated fecal pathogens. They are bacteria that are normally prevalent in the feces of warm-blooded animals including humans, farm animals, pets, and wildlife. High presence of indicator bacteria show that high levels of fecal matter may be in the waterbody, increasing the likelihood of human illness during water contact recreation. Mercury Mercury often enters waterbodies from air sources like coal-fired power plants whose particulates settle into nearby waters or from legacy mining operations. Improper handling and disposal of products containing mercury could also release the chemical into the air and water. When a waterbody is impaired for mercury, mercury can bioconcentrate in fish and other aquatic organisms. Their consumption poses a human health risk, particularly if the chemical form is methylmercury, which causes a variety of severe human illnesses. Nutrients Nutrients such as nitrogen and phosphorus are essential for plant growth and are fertilizer components. Excess nutrients, such as from agricultural runoff, can affect dissolved oxygen in waterbodies by accelerating the growth of algae and aquatic plants. The subsequent decay of these organic materials quickly deplete dissolved oxygen, harming aquatic life and habitat. pH pH is an expression of hydrogen ion concentration in water. Low pH refers to acidic solutions, while high pH refers to basic solutions. The pH of a water body can alter the chemical state of many pollutants, which can increase the exposure of toxic metals and nutrients to aquatic plants and animals. Sediment Sediment pollution refers to suspended organic and inorganic matter that is largely contributed by erosion of soil. Sediment pollution can clog aquatic organism gills and impact their life cycle negatively. Sediment loads can also increase the cost of drinking water and can result in odor and taste problems. Additionally, toxic chemicals become attached to sediment particles that may be released into the environment. Temperature Higher than ideal temperatures can cause issues for aquatic life in cold water habitats. Warmer waters also have decreased capacity for dissolved oxygen. Metals and other toxins are also more easily dissolved into warmer waters and can increase toxicity of some substances to aquatic organisms.General Point of Contact: Lance Le, Water Resource Control Engineer Email: Lance.Le@waterboards.ca.gov Integrated Report Contact: Mary Bartholomew, Environmental Scientist Email: Mary.Bartholomew@waterboards.ca.gov Description Sources: https://www.epa.gov/wqc https://www.waterboards.ca.gov/plans_policies/ https://www.waterboards.ca.gov/water_issues/programs/water_quality_assessment/

Service Item Id: 40dfebaa6cb94b978e7b4610839f4ace

Copyright Text: These layers were generated by North Coast Regional Water Quality Control Board staff Mary Bartholomew, Darby Radley, Lance Le and Megan Kownurko, a Corpsmember from the California Conservation Corps Watershed Stewards Program in partnership with AmeriCorps.

Spatial Reference: 3310 (3310) LatestVCSWkid(0)

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Units: esriMeters

Document Info:

N/A Enable Z Defaults: true

Supports ApplyEdits With Global Ids: false

Supports Dynamic Layers: false

Child Resources: Info Relationships

Supported Operations: Query Query Contingent Values Append Get Estimates