Course Glossary

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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.

Browse the glossary using this index

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Entries starting with: M

M Sample

Sample collected from the location in the distribution system with the maximum residence time.

  • (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)

 

M/DBP

M/DBP – Microbial/Disinfectants and Disinfection Byproduct

  • (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)

M/R

Monitoring and Reporting

  • (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)

Mandatory Health Effects Language

Specific health effects language required for primary MCL or MRDL violation, treatment technique violations and violation of the condition of a variance or exemption.

  • (PNR10) Public Notification – An Introduction for NCWSs (2332)
  • (PNR11) Public Notification – Violations and Tiers for NCWSs (2333)

Maximum Contaminant Level

  1. Maximum Contaminant Level (MCL)
    • (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)

Maximum Contaminant Level Goal

Maximum Contaminant Level Goal (MCLG)

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)

Maximum Residence

That area of the distribution system where the water has the longest standing time and the longest contact time with a chemical disinfectant.

diagram of a water system

  • (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)
  • (DBP15) DBP Rule – Maintaining Compliance for Pa. PWSs using Chlorine/Chloramines (1570)
  • (DBP30) DBP Rule Monitoring and Reporting Requirements for PWSs Using Ozone (1279)
  • (DBP40) Enhanced Coagulation – Basics (1280)
  • (LCR10) Lead and Copper Rule – Basics (1423)
  • (LCR11) LCR – Initial Planning, Monitoring and Reporting (1488)
  • (TCR01) Total Coliform Rule – Overview (1424)
  • (TCR02) Total Coliform Rule – Monitoring And Reporting Requirements (1425)
  • (TCR03) Total Coliform Rule – Maintaining Compliance (1426)

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)

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