Course Glossary


This shows the specialized terms used in EarthWise Academy. This section contains all the definitions used in the various course glossaries used by each course.

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M

Maximum Residual Disinfectant Level

  1. Maximum Residual Disinfectant Level (MRDL)
    • (DBP01) DBP Rule – Overview (1282)
    • (DBP14) DBP Rule Violations for Pa. PWSs using Chorine⁄Chloramines (1825)
    • (DBP15) DBP Rule – Maintaining Compliance for Pa. PWSs using Chlorine/Chloramines (1570)
    • (DBP30) DBP Rule – Monitoring and Reporting Requirements for PWSs Using Ozone (1279)
    • (PNR01) Public Notification – An Introduction for NCWSs (2332)
  2. The maximum permissible level of a disinfectant added for water treatment that may not be exceeded at the consumer's tap without an unacceptable possibility of adverse health effects.
    • (CCR01)Consumer Confidence Report (CCR) Overview (2338)
    • (DBP02) DBP Rule Monitoring and Reporting – Job Aids (1283)
    • (DBP10) DBP Rule Monitoring and Reporting for Chlorine⁄Chloramines (1284)
    • (DBP13) DBP Rule Monitoring and Reporting for TTHM⁄HAA5 (1285)
    • (DBP14) DBP Rule Violations for Pa. PWSs using Chorine⁄Chloramines (1825)
    • (DBP20) DBP Rule Monitoring and Reporting for PWSs Using Chlorine Dioxide (1278)
    • (PNR11) Public Notification – Violations and Tiers for NCWSs (2333)

MCL

  1. MCL - Maximum Contaminant Level
    The maximum permissible level of a contaminant in water that is delivered to a user of a public water system.
    • (CCR01)Consumer Confidence Report (CCR) Overview (2338)
    • (DBP01) DBP Rule – Overview (1282)
    • (DBP02) DBP Rule Monitoring and Reporting – Job Aids (1283)
    • (DBP10) DBP Rule Monitoring and Reporting for Chlorine⁄Chloramines (1284)
    • (DBP13) DBP Rule Monitoring and Reporting for TTHM⁄HAA5 (1285)
    • (DBP14) DBP Rule Violations for Pa. PWSs using Chorine⁄Chloramines (1825)
    • (DBP15) DBP Rule – Maintaining Compliance for Pa. PWSs using Chlorine/Chloramines (1570)
    • (DBP20) DBP Rule Monitoring and Reporting for PWSs Using Chlorine Dioxide (1278)
    • (DBP30) DBP Rule Monitoring and Reporting Requirements for PWSs Using Ozone (1279)
    • (DBP40) Enhanced Coagulation – Basics (1280)
    • (LCR11) LCR – Initial Planning, Monitoring and Reporting (1488)
    • (PNR01) Public Notification – An Introduction for NCWSs (2332)
    • (RAD01) Radionuclide Rule – Initial Monitoring and Reporting (1503)
  2. The highest amount of a contaminant that the EPA allows which helps ensure that drinking water does not pose either a short-term or long-term health risk. Unless otherwise specified, MCLs are defined in milligrams per liter (parts per million).
    • (LCR10) Lead and Copper Rule — Basics (1423)
    • (TCR01) Total Coliform Rule – Overview (1424)
    • (TCR02) Total Coliform Rule – Monitoring And Reporting Requirements (1425)
    • (TCR03) Total Coliform Rule – Maintaining Compliance (1426)

MCLG

MCLG – Maximum Contaminant Level Goal

The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs allow for a margin of safety.

  • (CCR01)Consumer Confidence Report (CCR) Overview (2338)

MCRT

MCRT - Mean Cell Residence Time

An expression of the average time that a microorganism or solid particle undergoes aeration in the activated sludge process.

  • (BIO10) Estimating Sludge Volume (2343)
  • (BNR01) Nitrification and Denitrification – An Introduction to Nitrogen Removal (1485)
  • (BNR02) Nitrification Factors – Suspended Growth Treatment Systems (1821)

Mean Cell Residence Time

Mean Cell Residence Time (MCRT)

An expression of the average time that a microorganism or solid particle undergoes aeration in the activated sludge process.

  • (BIO10) Estimating Sludge Volume (2343)
  • (BNR01) Nitrification and Denitrification – An Introduction to Nitrogen Removal (1485)
  • (BNR02) Nitrification Factors – Suspended Growth Treatment Systems (1821)

Methemoglobinemia

Blood disorder caused when nitrite, converted from nitrate in the digestive system, interacts with the hemoglobin in red blood cells forming methemoglobin which cannot carry sufficient oxygen to the body's cells and tissues.

  • (BIO01) Biosolids Agronomic Loading Rates Part 1 (1247)
  • (BIO02) Biosolids Agronomic Loading Rates Part 2 – Manure (1484)

MGD

Million Gallons per Day

  • (BNR02) Nitrification Factors – Suspended Growth Treatment Systems (1821)

Microbial/Disinfectants and Disinfection Byproduct

Microbial/Disinfectants and Disinfection Byproduct – (M/DBP)

  • (DBP02) DBP Rule Monitoring and Reporting – Job Aids (1283)
  • (DBP10) DBP Rule Monitoring and Reporting for Chlorine⁄Chloramines (1284)
  • (DBP13) DBP Rule Monitoring and Reporting for TTHM⁄HAA5 (1285)

Microflocs

  1. Tiny masses of non-settleable microorganisms and particles that come together to form progressively larger, heavier particles.
    • (COA01) Coagulation – Part 1: The Chemistry of Coagulation (1248)
  2. Very small (usually visible to the human eye) masses of non-settleable microorganisms and particles. These are beginning stages of flocs that come together to form progressively larger, heavier particles.
    • (COA02) Coagulation — Part 2: Coagulation Chemicals (1249))

Million Gallons per Day

Million Gallons per Day – MGD

  • (BNR02) Nitrification Factors – Suspended Growth Treatment Systems (1821)

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