Cost to Water Main Replacement in St. Louis, MO

$1,320–$6,160 in St. Louis

12% below the national average · 0.88x cost multiplier

In St. Louis, a water main replacement runs $1,320 to $6,160 on average — about 12% below what homeowners pay nationwide. The Midwest market's labor costs account for most of the gap, with material pricing and local permitting fees adding to the spread. Use the cost table below to compare budget, mid-range, and premium options side by side.

Cost Breakdown in St. Louis

Line Item	Low	Mid	High
Cost per linear ft	$44	$88	$220
Materials	$352	$792	$1,760
Labor	$1,056	$2,288	$4,400
Permits	$264	$440	$704
Total	$1,672-12% vs. national avg	$3,520-12% vs. national avg	$6,864-12% vs. national avg

Budget

Short run under 25 feet from meter to house, simple trenching in soft soil, new PEX or copper supply line.

Mid-Range

50-75 foot run, standard trenching, new copper or PEX pipe, meter reconnection, permit and inspection.

Premium

100+ foot run, difficult access, landscaping or driveway crossing, full trench restoration, concrete or asphalt repair.

Material Options

Material prices below are national averages; availability in St. Louis may shift costs slightly.

Material	Cost/Unit	Pros	Cons	Best For
Copper (Type K)	$3-$8 per linear ft	50+ year lifespan, approved everywhere, resistant to UV if exposed, proven performance	Most expensive material, price fluctuates with commodity markets, requires soldering	Homes where longevity and maximum reliability are the priorities50+ year lifespan, approved everywhere, resistant to UV if exposed, proven performance
PEX (Cross-Linked Polyethylene)	$0.50-$1.50 per linear ft	Flexible for easy routing, freeze-resistant, corrosion-proof, fast installation	Must be UV-protected if exposed, requires specific fittings, not approved in all jurisdictions for underground	Most residential water main replacements in moderate climates with code approvalFlexible for easy routing, freeze-resistant, corrosion-proof, fast installation
HDPE (High-Density Polyethylene)	$1-$3 per linear ft	Very flexible, ideal for directional boring, long lifespan, corrosion-resistant	Requires heat fusion or mechanical fittings, less common for residential than commercial	Long runs and trenchless (directional bore) installationsVery flexible, ideal for directional boring, long lifespan, corrosion-resistant
Galvanized Steel (Replacement Only)	N/A - being replaced, not installed	N/A	Prone to corrosion and buildup, commonly the cause of replacement, restricted water flow over time	Not recommended - this is what is being replaced in most older homesN/A

Other Projects in St. Louis

Full Kitchen Remodel

Basement Finishing

Roof Replacement (Asphalt Shingles)

Back to national average for Water Main Replacement

St. Louis Estimate

Typical Range

$1,320–$6,160

vs. National Average

12% below national

Cost Multiplier

0.88x

Cost Per linear ft

$44–$220

Estimates apply St. Louis's 0.88x regional cost multiplier to national averages. Actual bids vary by contractor, project scope, and timing.

See national average costs →