Website

https://www.epa.gov/waterdata/water-quality-data-upload-wqx

Region(s)

NW, SE, SW

Summary

Water quality data repository This is not a monitoring program but a database of data from monitoring programs. EPA's repository of the water quality monitoring data collected by water resource management groups across the country. Includes water quality, chemical parameter measurements made in the field or lab, physical parameter measurements such as water temperature or pH, biological sampling results, and habitat assessments or observations.

Parameters

Parameters vary depending on the program, but can include: Alkalinity (mg/L, ueq/L), aluminum (mg/L), ammonia-nitrogen as N (mg/L, ueq/L), ammonium (mg/L, ueq/L), anion deficit (ueq/L), apparent color (pt), arsenic (mg/L, ug/L), barium (mg/L), beryllium (mg/L), bicarbonate (ueq/L), bromacil (ug/L), calcium (mg/L, ug/L, ueq/L), carbon (mg/L), carbonate (ueq/L), chloride (mg/L, ueq/L), chlorophyll a (mg/L, ug/L), conductivity (mS/cm, umho/cm, uS/cm), copper (mg/L, ug/L), depth (m), secchi depth (m), dissolved oxygen (mg/L, ppm), diuron (ug/L), enterococcus (cfu/100mL), fecal coliform (cfu/100mL), fluoride (mg/L), gran acid neutralizing capacity (ueq/L), hardness (Ca, Mg, carbonate; mg/L), hydrogen (ueq/L), hydroxide (ueq/L), inorganic carbon (mg/L), inorganic nitrogen (NO2 + NO3 and NH4; mg/L), ionic strength (m), iron (mg/L, ug/L), kjeldahl nitrogen (mg/L), lead (mg/L, ug/L), PAR (uE/m2/sec), light transmissivity (%), magnesium (mg/L, ueq/L), manganese (mg/L), mercury (mg/L, ug/L), nickel (mg/L), nitrate (mg/L, ueq/L), nitrite (mg/L), nitrogen (mg/L, ug/L), nutrient-nitrogen (mg/L), organic anions (ueq/L), organic carbon (mg/L), organic nitrogen (mg/L), organic phosphorus (mg/L), orthophosphate (mg/L, ug/L), pH, pheophytin a (mg/L, ug/L), phosphate (mg/L, ug/L), phosphorus (mg/L, ug/L), particulate organic phosphorus (mg/L), potassium (mg/L, ueq/L), salinity (ppt), selenium (ug/L), silica (mg/L, ug/L), silicate (mg/L), sodium (mg/L, ueq/L), specific conductance (umho/cm), sulfate (ueq/L), sum of anions (ueq/L), sum of cations (ueq/L), tannin and lignin (mg/L), temperature (deg. C, deg. F), total coliform (cfu/100mL), total hardness (mg/L), total particulate nitrogen (mg/L), total solids (mg/L), total suspended solids (mg/L), transparency (m), true color (PCU), turbidity (NTU), zinc (mg/L, ug/L)

Notes

Application

Publications

Start

early 1960's

End

Current

Frequency

Variable

Method

various sampling and analytical methods

Discontinuity

Data Location

https://www.waterqualitydata.us/portal/

Data Format

various
STORET Data Warehouse

Habitats

Water Column

SEACAR Citation

U.S. Environmental Protection Agency (EPA). (2024). EPA STOrage and RETrieval Data Warehouse (STORET)/WQX. Updated 06/06/2025. Distributed by: SEACAR Data Discovery Interface, Office of Resilience and Coastal Protection, Florida Department of Environmental Protection. https://data.florida-seacar.org/programs/details/103

Alternative Citation

indicates priority attributes