Generally, there are six categories of data collected:

E.Coli Bacteria

  1. Contact Recreation - E. Coli Bacteria
    • Human pathogen indicator
    • 4 times per year/reach
  2. Non-Contact Recreation - Visual assessment form
    • Aesthetic appeal to average person
    • Garbage, odor, algae, clarity, etc
  3. Water Quality - Chemical measurements
    • Nutrients (Nitrate-N, Ammonia-N, and Orthophosphorus
    • Total Suspended Solids and Turbidity
    • Dissolved Oxygen, Conductivity, pH and Temperature
  4. Sediment Quality - Sediment Chemistry
    • Sampled at mouths of streams once per year
    • Aggregates watershed inputs
    • Metals, PAHs, pesticides and herbicides
  5. Habitat Quality - Forms based on visual assessment and direct measurements
    • EPA national protocol, qualitative
    • Non-scoring Pfankuch channel stability form
  6. Aquatic Life
    • Benthic Macroinvertebrate Community (invertebrates)
      • 9 metrics assessing: Diversity, Pollution Tolerance and Community Structure
      • Evaluates stream health in terms of the preceding months to years
    • Diatom Community (single cellular algae on rocks)
      • Pollution Tolerance Index and Percent Similarity to Reference Conditions
      • Evaluates stream health in terms of the preceding months to years

More detailed information on the specific methods for field and lab analysis in addition to metrics for determining scores is located in report COA-ERM-1999-01 Environmental Integrity Index Methodology, May 31, 2002 edition.

Click here to see the open data of Environmental Integrity Index results.

We have developed a watershed viewer, so it is easy to find out what watershed you live in and to find out its Environmental Integrity Index score. 

The current two-phase monitoring cycle involves the monitoring of 122 sample sites within 49

watersheds in the City’s planning area.