Blog Archives

What is Turbidity?

Turbidity is the measurement of the clarity or cloudiness of water. A turbidity measurement is used to determine the quality of drinking water and the effectiveness of the filtration process.  High turbidity levels can often signal higher levels of disease

Posted in Glossary of Terms

Calculating MCL

What is equivalent daily human intake for the average human? Intake = RfD × body weight = 1 × 70 = 70 mg/day (Assume RfD = 1 mg/kg/day) What concentration in drinking water would provide this intake? Water concentration =

Posted in MCL

Maximum Contaminant Levels for Drinking Water

MCL is the Maximum Contaminant Level, or concentration of a chemical, that is allowed in public drinking water supplies.  MCL standards are set by the U.S. Environmental Protection Agency (EPA). There are currently fewer than 100 chemicals with a set MCL.

Posted in MCL

Newsletter

Subscribe to receive the latest test taking tips, practice questions, math hints, and Water Distribution Operator news.

Updates

  • 01-27-15
    NEW Added 100 question practice test which shows answers immediately, instead of at the end.
  • 11-10-14
    Complete redesign of website to match our Water Distribution Certification website. Also, working on new content to be added soon.

Glossary of Terms

Action Level - The concentration of lead or copper in water which determines, in some cases, the treatment requirements for source water or corrosion control.

Quick Facts

Nearly 97% of the world’s water is salty or otherwise undrinkable. Another 2% is locked in ice caps and glaciers. That leaves just 1% for all of humanity’s needs — all its agricultural, residential, manufacturing, community, and personal needs.
s2Member®