Flanges for Waterworks & Municipal Water Systems
AWWA-certified solutions engineered for water treatment, distribution networks, and pump station applications with NSF-61 compliance and Buy America certification.
Reliable Flanges for Critical Water Infrastructure
ApiFlange supplies precision-engineered flanges for the complete spectrum of municipal water systems. From intake facilities and treatment plants to distribution mains and pump stations, our AWWA-compliant products ensure leak-free, corrosion-resistant performance. Whether you're managing cast iron water mains, upgrading transmission lines, or constructing new treatment facilities, our flanges meet the stringent demands of potable water applications with NSF-61 certification and full BABA/Buy America compliance.
NSF-61 Certified
Potable water safe
AWWA Compliant
C207 standards
BABA Approved
Buy America certified
Long Service Life
50+ year design
AWWA Standards & Specifications
ApiFlange provides comprehensive AWWA C207 flange solutions across all pressure classes, sourced to exacting standards for use in municipal water applications, from low-pressure gravity feed systems to high-pressure transmission mains.
AWWA C207 Classes
Class B - 100 psi
Low-pressure systems, gravity feed
Class D - 150 psi
Standard distribution systems
Class E - 175 psi
Higher pressure transmission
Class F - 250 psi
Maximum pressure applications
Compliance & Certifications
- ✓AWWA C207 - Steel Pipe Flanges
- ✓NSF/ANSI 61 - Potable Water Safety
- ✓ASME B16.5 - Flange Dimensions
- ✓BABA/Buy America - Domestic Production
- ✓CFR Title II - American Iron & Steel
- ✓AWWA C504 - Rubber Gaskets for Water
Common Flange Types for Water Applications
Slip-On Flanges
Most common type for water mains, installed by slipping over pipe and welding. Cost-effective and reliable for standard applications.
Blind Flanges
Used to cap pipe ends at distribution terminals and dead-end lines. Critical for system isolation and maintenance access.
Plate Flanges
Flat flanges for connection to equipment nozzles, such as pump suction/discharge connections and valve bodies.
Backing Flanges
Support flanges for epoxy-coated pipes or when additional reinforcement is required around the weld area.
Reducing Flanges
Accommodate transitions between different pipe sizes, minimizing turbulence and flow restrictions.
Companion Flanges
Bolted to grooved or specialty fittings for modular piping systems in modernization projects.
Materials for Water Service
Water service demands corrosion resistance and durability. ApiFlange offers proven material selections with comprehensive coating options to ensure decades of leak-free service.
Primary Materials
Carbon Steel (A105/A350)
Standard choice for water mains, typically coated. Cost-effective and widely specified.
Ductile Iron (A536)
Traditional water industry standard, excellent corrosion resistance with proper coatings.
Cast Iron (A126)
Legacy systems, still used for AWWA C207 Class B low-pressure applications.
Protective Coatings
NSF-61 Epoxy (Interior)
FDA-approved potable water contact surfaces
FBE Epoxy (Exterior)
Corrosion protection on buried or submerged lines
Galvanized Steel
Hot-dip zinc coating for atmospheric exposure
Polyethylene (PE Coating)
Complete encapsulation for maximum life extension
Size & Pressure Ranges
ApiFlange supplies water service flanges in all AWWA-standard sizes from 4 inches through 96 inches and beyond, covering the complete spectrum of municipal applications.
Standard Sizes
4" to 96"
All AWWA classes
Pressure Classes
100-250 psi
Class B through F
Larger Sizes
Custom Available
Up to 120"+ diameter
For specialized applications exceeding standard catalogs, ApiFlange sources custom AWWA-compliant flanges to your specifications with full documentation and mill certifications.
BABA/Buy America Compliance
ApiFlange water service products are sourced from domestic mills to meet Buy America Act (BABA) requirements and CFR Title II standards. This is critical for municipally-funded projects and government-assisted water infrastructure improvements. Our products are eligible for BABA-compliant procurement without additional certifications.
BABA Benefits for Your Project
- ✓Simplified procurement without BABA certification delays
- ✓Eligible for SRF and other federally-assisted water funds
- ✓Supports domestic sourcing and local jobs
- ✓Single-source documentation for compliance verification
- ✓No markup or certification fees required
Common Water Project Types
ApiFlange has equipped thousands of water infrastructure projects. Our experience covers the full range of municipal and industrial water system applications.
Water Treatment Plants
- •Clarifier feed/discharge
- •Filter underdrains
- •Pump station connections
- •Effluent piping
- •Chemical handling lines
Distribution Systems
- •Transmission main connections
- •Booster pump stations
- •Pressure reducing station
- •Flow meter installations
- •Isolation valve assembly
Specialized Applications
- •Intake structure gates
- •Sedimentation basin
- •Reservoir outlet works
- •Reclaimed water lines
- •Recycled water loop
Ready to Specify for Your Water Project?
Contact our water systems specialists to discuss your AWWA requirements, delivery timeline, and BABA compliance needs.