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.

Browse the glossary using this index

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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)

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)

Mineralization

The conversion of an element from an organic form to an inorganic state as a result of microbial activity.

Mineralization Illustration

Mixed Liquor Suspended Solids

Mixed Liquor Suspended Solids (MLSS)

The concentration of suspended solids (both organic and inorganic) in the mixed liquor of an aeration tank. MLSS is used as a measure of the concentration of microorganisms present.

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

Mixed Liquor Suspended Solids (MLSS)

The concentration of suspended solids (both organic and inorganic) in the mixed liquor of an aeration tank. MLSS is used as a measure of the concentration of microorganisms present.

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

MLSS

MLSS – Mixed Liquor Suspended Solids

The concentration of suspended solids (both organic and inorganic) in the mixed liquor of an aeration tank. MLSS is used as a measure of the concentration of microorganisms present.

MLSS – Mixed Liquor Suspended Solids (MLSS)

The concentration of suspended solids (both organic and inorganic) in the mixed liquor of an aeration tank. MLSS is used as a measure of the concentration of microorganisms present.

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

Monitoring and Reporting Violation

Any violation incurred for failing to monitor and/or report for a regulated parameter specified by the Pa. DEP.

  • (PNR01) Public Notification – An Introduction for NCWSs (2332)
  • (PNR11) Public Notification – Violations and Tiers for NCWSs (2333)

Monitoring Period

The time frame, generally in months, quarters, or years, during which water samples must be collected and tested in accordance with Pa Safe Drinking Water Regulations to determine compliance with applicable MCLs, MRDLs, or treatment techniques

  • (TCR01) Total Coliform Rule – Overview (1424)
  • (TCR02) Total Coliform Rule – Monitoring And Reporting Requirements (1425)
  • (TCR03) Total Coliform Rule – Maintaining Compliance (1426)

MRDL

  1. Maximum Residual Disinfectant Level
    • (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.
    • (BIO02) Biosolids Agronomic Loading Rates Part 2 – Manure (1484)
    • (CCR01)Consumer Confidence Report (CCR) Overview (2338)
    • (DBP02) DBP Rule Monitoring and Reporting – Job Aids (1283)
    • (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)

MRDLG

MRDLG – Maximum Residual Disinfectant Level Goal

The unenforceable maximum level of disinfectant added for water treatment for which there is no known risk to human health.

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

 

Multiple Service Connection

This refers to the condition where a PWS serves many individual buildings (connections), i.e., homes or businesses that use public water.

graphic showing difference between single service connection and multiple service connection

  • (TCR01) Total Coliform Rule – Overview (1424)
  • (TCR02) Total Coliform Rule – Monitoring And Reporting Requirements (1425)
  • (TCR03) Total Coliform Rule – Maintaining Compliance (1426)

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