any 12-consecutive month period of monitoring.

• (DBP30) DBP Rule – Monitoring and Reporting Requirements for PWSs Using Ozone (1279)

Optimal Corrosion Control Treatment - Corrosion control treatment that minimizes the lead and copper concentrations at users' taps while ensuring that the treatment does not cause the system to violate any primary maximum contaminant level.

• (LCR10) Lead and Copper Rule – Basics (1423)
• (LCR11) LCR – Initial Planning, Monitoring and Reporting (1488)

O&M – Operation and Maintenance

• (PNR01) Public Notification – An Introduction for NCWSs (2332)

A central mass about which other matter collects; a starting point for growth or development.

• (COA01) Coagulation – Part 1: The Chemistry of Coagulation (1248)
• (COA02) Coagulation – Part 2: Coagulation Chemicals (1249)

1. NTNCWS – Nontransient Noncommunity 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)
   • (DBP30) DBP Rule Monitoring and Reporting Requirements for PWSs Using Ozone (1279)
   • (TCR02) Total Coliform Rule – Monitoring And Reporting Requirements (1425)
   • (TCR03) Total Coliform Rule – Maintaining Compliance (1426)
2. A noncommunity water system that regularly serves at least 25 of the same persons over 6 months per year.
   • (LCR10) Lead and Copper Rule – Basics (1423)
   • (LCR11) LCR – Initial Planning, Monitoring and Reporting (1488)

NPDWR – National Primary Drinking Water Regulations

NPDWRs (or primary standards) are legally enforceable standards that apply to public water systems.

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

NPDES - National Pollutant Discharge Elimination System

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

NOV – Notice of Violation

1. An informal notice from the Pa DEP telling a regulated facility what aspects of a Pa. regulation they have not complied with.
2. An informal notice telling the PWS what aspects of the TCR they have not complied with.

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

Notice of Violation (NOV)

1. An informal notice from the Pa DEP telling a regulated facility what aspects of a Pa. regulation they have not complied with.
2. n informal notice telling the PWS what aspects of the TCR they have not complied with

• (TCR01) Total Coliform Rule – Overview (1424)

1. Nontransient Noncommunity Water System (NTNCWS)
   • (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)
   • (DBP30) DBP Rule Monitoring and Reporting Requirements for PWSs Using Ozone (1279)
   • (LCR12) LCR Planning Tools for CWS (2536)
   • (LCR13) LCR Planning Tools for NTNCWS (2537)
   • (TCR02) Total Coliform Rule – Monitoring And Reporting Requirements (1425)
   • (TCR03) Total Coliform Rule – Maintaining Compliance (1426)
2. A noncommunity water system that regularly serves at least 25 of the same persons over 6 months per year.
   • (LCR10) Lead and Copper Rule – Basics (1423)
   • (LCR11) LCR – Initial Planning, Monitoring and Reporting (1488)