Page review information
Edition covered
Municipal water / industrial wastewater standards stack — exact governing revisions not yet recorded — verify on the linked standards pages
Content status
Reviewed
Coverage
Section hub for water and wastewater treatment controls; standards stack and SCADA architecture at overview level.
Last reviewed
August 2026
Primary reference
The official published standard — required for final decisions

Confirm the governing edition, jurisdiction, and project-specific requirements before applying anything on this page.

Industry Reference — Water and Wastewater

Water and Wastewater Systems

Scope: This section covers control systems engineering for municipal drinking water treatment and industrial wastewater treatment. Standards selection, SCADA architecture, safety instrumented systems, and per-system control narratives with engineering diagrams.

Standards Selection

Use this flowchart to identify which standards apply to your project:

flowchart TD
    A[Water/Wastewater Project] --> B{Facility type?}
    B -->|Municipal drinking water| C[IEC 61511 + AWWA + EPA SDWA]
    B -->|Industrial wastewater| D[IEC 61511 + NFPA 820 + EPA CWA/NPDES]
    B -->|Both on same site| E[Apply all standards]
    C --> F{SCADA / remote access?}
    D --> F
    E --> F
    F -->|Yes| G[Add IEC 62443\nSCADA security zones]
    F -->|No| H[ISA-18.2\nAlarm management]
    G --> H
    H --> I[NEC Art. 430 / Art. 820\nPump and WW wiring]

Standards Applicability Matrix

Standard Municipal Water Industrial WW Notes
IEC 61511 Required Required SIL for chemical OT, overflow prevention, discharge trips
IEC 62443 Required Required SCADA security zones and conduits
ISA-18.2 Required Required Alarm rationalization
AWWA M31/M36 Required — Distribution system design, water audits
EPA SDWA Required — Maximum contaminant levels and treatment technique requirements
EPA CWA (NPDES) — Required Effluent permit limits: TSS, BOD, pH, TN, TP
NFPA 820 — Required Hazardous area classification — H₂S and CH₄ in biological treatment
NFPA 70 / NEC Required Required Art. 430 (motors), Art. 820 (wastewater), wet environment wiring

In This Section

flowchart LR
    A[Water/Wastewater Overview] --> B[Intake & Pumping]
    A --> C[Filtration & Clarification]
    A --> D[Chemical Dosing]
    A --> E[Distribution SCADA]
    A --> F[Equalization & Neutralization]
    A --> G[Treatment & Discharge]
    A --> H[Instrumentation Reference]
Page Covers
Intake & Raw Water Pumping Pump station control, start permissives, VFD sequencing
Filtration & Clarification Filter run/backwash cycle, turbidity control, coagulation
Chemical Dosing Chlorination, coagulant dosing, pH correction, OT shutdown
Distribution SCADA SCADA zones, RTU telemetry, IEC 62443 security, fallback logic
Equalization & Neutralization EQ basin sequencing, pH neutralization PID, industrial WW
Treatment & Discharge Activated sludge, DO control, effluent quality trips, NPDES
Instrumentation Reference Analyzer loops, instrument selection, HART, calibration
Trust Boundary — Engineering Judgment Required

This site is an independent educational reference for industrial automation standards. It paraphrases and organizes guidance in original language; it is not a substitute for the official published standards, professional engineering judgment, or legal review, and content has not been independently verified against current published editions.

Items marked Review pending await technical review against the identified edition. Items marked Planned have no reviewed source material behind them. Do not rely on this site for compliance determinations, safety-critical design decisions, or legal interpretation.