USGS - science for a changing world

Kansas Real-Time Water Quality

Total chlorophyll


Fluorescence of water is measured to estimate the chlorophyll concentration in the water. Chlorophyll is the green pigment in plants and algae. Chlorophyll measurements are used to dertermine how much algae is in the water. When a beam of light from the meter is shown on the water at a specific wavelength of 470 nanometers, chlorophyll and some other organic matter in the water fluoresce (emit or reflect) another wavelength of light at 650 to700 nanometers. A photodetector measures the amount of fluoresced light. That measurement then is converted to an equivalent measure of chlorophyll.

Water-quality standards and criteria are developed by the States, approved by the U.S. Environmental Protection Agency (USEPA), and then promulgated (passed into law) as standards by each State. Graphs on this website allow comparison of measured and computed data to these standards and criteria by plotting them as straight lines. When evaluating data to decide whether water quality is suitable for the intended use, viewers are cautioned to consider the uncertainty associated with these computed data.

Water-quality Standards and Criteria

USEPA proposed maximum for streams in Ecoregion VI: 7.33 ug/L

A criterion of 7.33 milligrams per liter has been recommended by the USEPA.

Source: USEPA Ambient Water Quality Criteria Recommendations, Region VI (view online)

Stations That Measure or Compute Continuous Total chlorophyll

Click a station to view measurements of total chlorophyll.

Station Name Station Identifier
Kansas River at Wamego, KS 06887500
Cedar Creek at Highway 56 at Olathe, KS 06892440
Olathe Lake near Olathe, KS 06892450
Blue River at Kenneth Road, Overland Park, KS 06893100
Blue R at Blue Ridge Ext in KC, MO 06893150
Indian Creek at State Line Road, Leawood, KS 06893390
Cheney Reservoir near Cheney, KS 07144790
L Arkansas R Upstream of ASR Fac Nr Sedgwick, KS 375350097262800

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: National Real-Time Water Quality Information
Page Last Modified: Wed 06 October 2010