Naturally occurring radiological contaminants including gross alpha, radium-226, radium-228, and uranium.

• (RAD01) Radionuclide Rule – Initial Monitoring and Reporting (1503)

Natural Organic Matter (NOM) - Organic matter that exists naturally in the water environment.

• (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)
• (DBP40) Enhanced Coagulation – Basics (1280)

National Primary Drinking Water Regulations (NPDWR)

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)

National Pollutant Discharge Elimination System (NPDES)

• (BNR01) Nitrification and Denitrification – An Introduction to Nitrogen Removal (1485)

1. Buildings that are not used by a LSL and do not contain lead pipes or copper pipes with lead solder
2. Building containing copper plumbing materials (lead-free solder) installed after January 6, 1991

• (LCR13) LCR Planning Tools for NTNCWS (2537)

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

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

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)

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)

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)

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)