Waterbody Quality Assessment Report | WATERS

Causes of Impairment
TMDLs That Apply to This Waterbody
Previous Causes of Impairment Now Attaining All Uses

State: California
Waterbody ID:
Other ID: CA404.0590R A LS POSAS R1
Location:
State Waterbody Type: Stream/Creek/River
EPA Waterbody Type: Rivers and Streams
Water Size: 1.99
Units: miles
Watershed Name: Calleguas

Waterbody History Report

1998 Waterbody Report for Arroyo Las Posas Reach 1 (Lewis Somis Rd To Fox Barranca)

Waterbody Map Not Available

Features

Causes of Impairment for Reporting Year 1998

Description of this table

Cause of Impairment	Cause of Impairment Group	State TMDL Development Status
Ammonia	Ammonia	TMDL completed
Chloride	Salinity/Total Dissolved Solids/Chlorides/Sulfates	TMDL needed
DDT	Pesticides	TMDL needed
Nitrate/Nitrite	Nutrients	TMDL completed
Sulfates	Salinity/Total Dissolved Solids/Chlorides/Sulfates	TMDL needed
Total Dissolved Solids (TDS)	Salinity/Total Dissolved Solids/Chlorides/Sulfates	TMDL needed

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TMDLs That Apply to this waterbody

Description of this table

TMDL Document Name	TMDL Date	TMDL Pollutant Description	TMDL Pollutant Source Type	Cause(s) of Impairment Addressed
Calleguas Creek, Its Tributaries And Mugu Lagoon Nitrogen Compounds And Related Effects Tmdl	Oct-15-2009	Ammonia Nitrogen	Point/Nonpoint Source	Nitrate/Nitrite; Ammonia
Calleguas Creek, Tributaries, And Mugu Lagoon Nitrogen Compounds And Related Effects Tmdl	Jun-20-2003	Algae	Point/Nonpoint Source	Ammonia; Nitrate/Nitrite
Calleguas Creek, Tributaries, And Mugu Lagoon Nitrogen Compounds And Related Effects Tmdl	Jun-20-2003	Ammonia	Point/Nonpoint Source	Nitrate/Nitrite; Ammonia
Calleguas Creek, Tributaries, And Mugu Lagoon Nitrogen Compounds And Related Effects Tmdl	Jun-20-2003	Nitrate/Nitrite	Point/Nonpoint Source	Ammonia; Nitrate/Nitrite
Calleguas Creek, Tributaries, And Mugu Lagoon Nitrogen Compounds And Related Effects Tmdl	Jun-20-2003	Nitrogen	Point/Nonpoint Source	Nitrate/Nitrite; Ammonia
Calleguas Creek, Tributaries, And Mugu Lagoon Nitrogen Compounds And Related Effects Tmdl	Jun-20-2003	Organic Enrichment/Low Dissolved Oxygen	Point/Nonpoint Source	Nitrate/Nitrite; Ammonia

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Previous Causes of Impairments Now Attaining All Uses

No causes of impairment are recorded as attaining all uses for this waterbody.

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