Water & Wastewater Treatment
When Equipment Failure Means More
Water and wastewater treatment facilities operate in conditions that destroy ordinary electrical components: high humidity, corrosive gases (hydrogen sulfide, chlorine), temperature extremes, and electrical noise from VFD-driven pumps. Add in remote locations, limited access for maintenance, and the requirement for 24/7 reliability, and you understand why component selection matters.
Pump stations are the backbone of water distribution and wastewater collection, but they’re often located in remote sites with harsh conditions. Reliable pump control requires coordinated protection, sequencing, and fail-safe operation.
- Magnetic Contactors (IEC and NEMA) – 9A to 800A frames
- Thermal & Electronic Overload Relays – adjustable trip classes
- Manual Motor Protectors – thermal-magnetic protection for small pumps
- Phase Monitors & Sequence Relays – three-phase protection
- Float Switches & Level Controls – corrosion-resistant housings
- Pump Alternation Timers – relay and solid-state designs VFD
- Bypass Contactors – properly rated for PWM waveforms
- Disconnect Switches – fusible and non-fusible, 30A to 1200A
- Circuit Breakers – molded case, miniature, ground fault
- Fuse Holders & Fuses – Class CC, J, T time-delay
- Surge Protective Devices (SPDs) – service entrance, branch, signal
- Transformers – control power, isolation, auto-transformers Panel Meters & Monitors – voltage, current, power factor
Municiapl lift stations typically use alternating pump operation to balance run times, but the control scheme must prevent simultaneous starts (inrush current), protect against seal failures (minimum run timers), and handle emergency high-level conditions:
- Float Switches
- Pump Alternation Timers
- SCADA Interface Relays
Submersible pumps face unique challenges: seal failures cause water intrusion, clogged impellers increase motor current, and thermal overloads may not trip before winding damage occurs. Protection schemes must include:
- Thermal Overload Relays
- Phas Lose and Reversal
- Ground Fault Protection
- Seal Failture Sensors
Modern treatment plants use VFDs to match pump output to demand, reducing energy consumption and mechanical wear. However, VFDs introduce electrical challenges:
- Line Reactors & Harmonic Filters
- Bypass Contactors
- VFD Rated Contactors
- Shielded Cabling & Grounding
Water and wastewater facilities expose electrical equipment to moisture, corrosive gases, temperature extremes, and sometimes direct water spray. Proper enclosure selection is critical.
- NEMA 3R, 4, 4X, 6P Enclosures – steel, stainless, fiberglass, polycarbonate
- Explosion-Proof Enclosures – Class I, Division 1 & 2 rated
- Enclosure Accessories – heaters, cooling fans, lights, latches
- Cable Glands & Strain Relief – liquid-tight, NPT threaded, metric
- Terminal Blocks & DIN Rail – corrosion-resistant materials
- Grounding Busbars & Bonding Jumpers
Water and wastewater facilities expose electrical equipment to moisture, corrosive gases, temperature extremes, and sometimes direct water spray. Proper enclosure selection is critical:
- NEMA 3R
- NEMA 4/4X
- NEMA 6P
- Polycarbonate & Fiberglass
Specifying steel NEMA 4 enclosures in wastewater applications. Hydrogen sulfide gas corrodes steel enclosures within 2-3 years. Always specify stainless steel (304/316) or non-metallic enclosures for wastewater environments.
- Heating & Cooling
- Corrosion Resistant Hardware
- Cable Glands & Strain Relief
- Grounding Provisions
Accurate measurement of water level, flow rate, and pressure is essential for process control, regulatory reporting, and asset protection.
- Level Sensors – float, ultrasonic, pressure transducers
- Flow Meters – magnetic, ultrasonic, totalizing pH & ORP Analyzers – industrial-grade electrodes
- Pressure Transmitters – 4-20mA output, 0-100 PSI typical
- Temperature Sensors – RTD, thermocouple for process monitoring
- Leak Detection Probes – chemical storage areas
Float Switches, simple and reliable for pump on/off control, but require periodic cleaning to prevent buildup
- NAMCO snap lock switches with corrosion resistant housings
- Mercury free designs
- Adjustable mounting brackets for wet well installation
Non-contact measurement ideal for wastewater applications (no fouling)
- 4-20mA analog output for continuous level monitoring
- Temperature compensation for accuracy
- Narrow beam angle for small wet wells
Submersible sensors for level measurement in tanks and wet wells
- Vented cable design compensates for atmospheric pressure changes
- Stainless steel or titanium wetted parts (corrosion resistance)
- Lightning protection for outdoor installations
From 1/2 HP well pumps to 500 HP blower motors, water treatment facilities use a wide range of motor controls. Proper starter selection affects reliability, safety, and maintenance requirements.
- Timing Relays – on-delay, off-delay, interval, alternating
- Control Relays – ice cube, octal base, plug-in and socket
- Pilot Lights & Indicating Devices – LED, incandescent, stackable
- Selector Switches – HOA (Hand-Off-Auto), maintained contact
- Push Buttons – momentary, maintained, illuminated, mushroom head
- Limit Switches – heavy-duty, corrosion-resistant, snap-lock (Namco)
Wastewater pump panels should always include HOA switches. During startup or maintenance, operators need local control without depending on SCADA systems.
- Manual Motor Protectors
- IEC and NEMA Contactors
- Overload Relay Coordination
- Hand Off Auto Selectors
Large motors (>50 HP) benefit from soft starters or reduced-voltage starting to limit inrush current, reduce mechanical stress, and minimize voltage sag:
- Electric Soft Staters
- Wye Delta Starters
- Autotransformer Starters
- Bypass Contactors
Wastewater facilities can generate explosive methane/hydrogen sulfide mixtures, especially in confined spaces like wet wells, digesters, and septage receiving areas. Electrical installations in these areas require Division 1 or Division 2 rated components.
- Industrial Control Cable – THHN, XHHW, SOOW, shielded instrumentation
- VFD-Rated Cable – shielded, properly grounded for EMI suppression
- Cable Tray & Supports – PVC, aluminum, steel Cable Ties & Fasteners – UV-resistant, releasable, stainless steel
- Heat Shrink Tubing & Labels – thermal transfer, wrap-around (Panduit)
- Cord Grips & Cable Glands – strain relief and environmental sealing
OSHA and National Fire Protection Association (NFPA) regulations require hazardous location classification studies for wastewater facilities. We can provide Division 1 and Division 2 rated components, but design should be reviewed by qualified engineers.
- Explosion Proof Enclosures
- Explosion Proof Lighting
- Sealing Fittings
- Dust Ignition Proof Enclosures
- Purged & Pressurized Enclosures
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