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Certifications & Memberships
A
AWWA
D
DOT
N
NASSCO
O
OSHA 30
E
EPA-SW
A
AGA
A
APWA
D
DOTPQ
Est. 2004 · Municipal Pipeline Division

Building What
Cities Run On.

Every community deserves infrastructure that outlasts the people who built it. Water, gas, sewer, stormwater — we put it in the ground right the first time.

Start a Project ConversationView Capabilities
340+
Miles Laid
82
Municipalities
20yr
Track Record
Aerial view of completed pipeline corridor with restored street surface and valve covers visible
Latest Completion
Riverside District Water Main
18″ DI · 4.2 mi · City of Hargrove, OH
Our Purpose

Resilient cities start below the surface.

The infrastructure that defines a city's future is invisible by design — buried under every street, park, and building. We build systems engineered for the next fifty years, not the next budget cycle.

Large diameter pipeline sections staged at a construction site ready for installation
Pipe staging · 36″ DI · Lakewood Transmission Main
What We Deliver
  • Water Transmission
    4″ – 54″ diameter, ductile iron, HDPE, PVC
  • Natural Gas Distribution
    Steel & polyethylene, API 5L certified
  • Sanitary Sewer
    Gravity & force main, CIPP lining, CCTV inspection
  • Stormwater
    RCP, CMP, HDPE, detention systems
Pipeline workers in safety gear installing a large diameter pipe section in an open trench at dawn
Pre-dawn installation · East Branch Interceptor · 2023
Our Certifications
  • AWWA Certified
    Water distribution & transmission systems
  • DOT Pre-Qualified
    Ohio, Indiana, Kentucky, Pennsylvania
  • NASSCO Member
    Sewer assessment & rehabilitation standards
  • AGA Qualified
    Natural gas operator qualification program
Our Conviction

Future-ready utilities aren't built by the lowest bidder.

Aging infrastructure fails at the worst possible moments. We partner with utility directors to plan capital improvements that close the gap between what exists and what communities deserve — on schedule, within scope.

Capabilities & Fleet

The right crew and the right
certifications.

Before permits clear, Mainline is already mobilized. Our fleet, certifications, and bonding capacity are ready for public works timelines.

Total Pipeline Installed
340+
linear miles
Active Certifications
AWWA CertifiedDOT Pre-QualifiedNASSCO MemberOSHA 30AGA QualifiedEPA StormwaterAPWA MemberAPI 5L Certified
Primary Fleet
  • Excavators
    Cat 320 & 336, 8 units
  • Directional Drills
    Vermeer D23x30 S3, 4 units
  • Vac Excavators
    Vactor 2100, 3 units
  • Fusion Machines
    McElroy 412, 2 units
  • Pipe Layers
    Cat PL61, 2 units
  • Trench Compactors
    Dynapac CA1500, 6 units
Project Types
Water Main
Natural Gas
Sanitary Sewer
Stormwater
Bonding Capacity
$85M
single project limit
Aggregate capacity $200M. Surety: Liberty Mutual Bond.
Safety Record
1.1 EMR
Experience Modification Rate · 3yr avg
Insurance Coverage
GL: $10M per occurrence
Auto: $5M combined single limit
Workers Comp: Statutory limits
Umbrella: $25M excess
Response Times
Emergency mobilization: 4hr
Bid submission: 72hr
Pre-construction meeting: 48hr
Completed Projects

Across the region,
underground.

82+
Municipalities
$1.4B
Work Completed
340+
Miles Installed
OHINKYPA
Water Transmission
Columbus, OH
36″ · Ductile Iron
6.8 mi · 2024
Sanitary Sewer
Indianapolis, IN
24″ · PVC / CIPP Lined
3.2 mi · 2023
Natural Gas
Louisville, KY
12″ · Steel API 5L
5.1 mi · 2023
Stormwater
Pittsburgh, PA
48″ · RCP
1.9 mi · 2022
Water Main
Dayton, OH
18″ · HDPE
4.2 mi · 2024
Force Main
Cincinnati, OH
16″ · Ductile Iron
2.7 mi · 2022
Water Transmission
Lexington, KY
30″ · HDPE
8.3 mi · 2021
Service Region
Completed project

Tap a pin to expand project details

Select a project pin on the map to view detailed specs and municipality information.

Water Transmission·Natural Gas Distribution·Sanitary Sewer·Stormwater Management·Force Main·HDD Boring·Pipe Rehabilitation·Emergency Response·Capital Improvement·Utility Relocation·Water Transmission·Natural Gas Distribution·Sanitary Sewer·Stormwater Management·Force Main·HDD Boring·Pipe Rehabilitation·Emergency Response·Capital Improvement·Utility Relocation·
Get In Touch

Ready to put pipe in the ground?

Primary Conversion

Start a Project Conversation

For municipal engineers, utility directors, and GCs. We respond within one business day.

Secondary Conversion

Download Our Municipal Capabilities Brief

12-page PDF covering certifications, fleet specs, bonding capacity, and reference projects. Designed for internal circulation before a bid call.

  • —Full certification listing with expiration dates
  • —Fleet inventory with operator qualifications
  • —Project reference list by municipality
  • —Safety record and EMR documentation
Direct Contact
Project Development
Daniel Kowalski, PE
(614) 882-4400
Municipal & utility contracts
Estimating
Marcus Webb
estimating@mainlinepipe.com
Bid packages & RFPs
Emergency Response
24/7 Dispatch
(614) 882-4411
Available around the clock
Mainline Infrastructure, Inc.
4820 Industrial Parkway, Suite 100
Columbus, OH 43219
Licensed · Bonded · Insured