Storage tank
$1,600–$2,400Typical cost, including installation
WATER HEATER REPLACEMENT IN LAKE ST. LOUIS
Lake St. Louis Water Heater
Replacement
Take a photo of your old water heater to start a replacement quote.
Get a water heater quotePhotos optional. No payment or booking.
See what replacement costs ↓LAKE ST. LOUIS AT A GLANCE
Replacing a water heater in Lake St. Louis.
Lake Saint Louis handles a water heater replacement as a home MEP (mechanical/electrical/plumbing) permit on its Citizenserve portal. The minimum is $75 (permit plus plan review) under the March 2024 fee table. Contractors need St. Charles County trade licenses, and owners who live in the home must pass a city homeowner exam to do their own work. Electricity comes from Cuivre River Electric Cooperative, which offers up to $750 back on a heat pump water heater.
- Permit to replace with the same type
- Yes · City of Lake Saint Louis Community Development, Building Division
- Permit fee
- MEP permits: a $50 minimum permit fee (or 0.006 × construction cost above $8,334) plus a $25 minimum plan review fee (or 0.0012 × cost above $20,834), so a small job is at least $75 (Updated Fee Table, March 1, 2024).
- Who gets the permit
- The city says plumbing and electrical work must be done by a contractor licensed in that trade, and its policy refers to plumbers and mechanical contractors licensed by St. Charles County. Owners who live in a detached single-family home can do limited mechanical work (replacing equipment with the same capacity and rating) and limited plumbing after passing the Lake Saint Louis Homeowner Code Examination.
- Electric utility
- Cuivre River Electric Cooperative
- Gas utility
- Spire
- Water
- St. Charles County Public Water Supply District #2 for most of the city; the city's water service provider map also shows an area served by the City of Wentzville · PWSD #2: 184 mg/L (about 10.8 gpg) highest carbonate hardness (range 142–184 mg/L) in September 2023 samples, reported in its 2025 Annual Water Quality Report
- Rebate worth checking
- Heat Pump Water Heater rebate (Active)
- Typical home
- Built 2000 (median) · 76% owner-occupied
- Companies found
- 3 that advertise water heater work
01 / TYPICAL PRICES
What a new water heater costs.
Know before you call.
Heat-pump tank
$2,500–$5,000Typical cost, including installation
Tankless
$2,400–$5,400Typical cost, including installation
AI equipment illustrations; models vary and images are not to scale. Typical national prices from Home Depot ↗, checked September 28, 2026. The source doesn’t say how many jobs the ranges are based on. These are not Lake St. Louis averages or guaranteed quotes.
Compare what each quote includes.Equipment · Labor · Permits · Old heater removalHow to compare quotes →
What we know about prices in Lake St. Louis
- National installer’s published rangeThe ranges above. Home Depot ↗
- Local permit feeMEP permits: a $50 minimum permit fee (or 0.006 × construction cost above $8,334) plus a $25 minimum plan review fee (or 0.0012 × cost above $20,834), so a small job is at least $75 (Updated Fee Table, March 1, 2024).. City of Lake Saint Louis Community Development, Building Division fee source ↗
- Local company’s advertised price1 of the companies listed for Lake St. Louis post water heater prices or specials on their websites: Arch Plumbing. Each offer has its own conditions.
- Measured local dataNot collected yet, so no Lake St. Louis average is shown.
What can change the price in Lake St. Louis?
Homeowners can only do same-type mechanical replacements. Adding new mechanical equipment needs a St. Charles County-licensed mechanical contractor, and new circuits beyond simple 120-volt circuits need a county-licensed electrician. The city's basement finish guide says if you enclose a gas or other fuel-burning water heater, the room needs air openings at the top and bottom.
02 / COMPANIES WE FOUND
Who replaces water heaters in Lake St. Louis?
Companies that advertise water heater replacement here, with what their water heater customers say.
Companies we found in our research. They are not Ember & Tank providers or partners. We show selected reviews, not a rating or every review. How we choose reviews →
Arch Plumbing
Lists Lake St. Louis among the areas it serves. Based in Lake St. Louis, MO area (site says 'Based near Lake St. Louis'; no street address shown).
- Tank
- Tankless
- Heat pump
- Repair
- Emergency service
Published price:
What the reviews say
Water heater feedback Customers praised quick scheduling for water heater replacements, including same-day and next-morning installs, and prompt, professional technicians.
Worth knowing No water heater complaints found in the sources checked.
4 water heater reviews read, checked September 30, 2026.
Performance Plumbing
Lists Lake St. Louis among the areas it serves. Based in 1104 S Callahan Rd, Wentzville, MO 63385.
- Tank
- Tankless
- Heat pump
- Repair
What the reviews say
Water heater feedback Customers praised on-time, tidy water heater replacements at a fair price, clear explanations, and no-pressure estimates.
Worth knowing No water heater complaints found in the sources checked.
4 water heater reviews read, checked September 30, 2026.
Faszold Heating, Cooling, Plumbing & Electrical (Faszold Service Co.)
Lists Lake St. Louis among the areas it serves. Based in 1613 East Terra Ln, O’Fallon, MO 63366.
- Tank
- Tankless
- Repair
- Emergency service
What the reviews say
We haven’t found reviews that mention this company’s water heater work yet.
Order: companies based in Lake St. Louis first, then companies whose water heater reviews we’ve read. Each group is alphabetical. These businesses are not our employees or vetted partners and do not receive requests from Ember & Tank. We haven’t checked their license, insurance or quality of work. Missouri has no statewide plumbing license (check your city or county) ↗.
FROM COMPANIES SERVING LAKE ST. LOUIS
Photos of water heater jobs from these companies.
HOMES IN LAKE ST. LOUIS
What Lake St. Louis homes are like.
2000Median year built
19%Built before 1980
76%Owner-occupied
63%Heat with utility gas
78%Single-family homes
The median home was built in 2000. A first or second replacement is common in homes this age.
63% of homes heat with utility gas, so gas water heaters with existing venting are common here.
U.S. Census Bureau, American Community Survey ACS 2024 5-year ↗ (2020-2024). Heating fuel is what homes use to heat the house. It often, but not always, matches the water heater’s fuel.
LOCAL CONDITIONS
What’s different in Lake St. Louis.
Homeowners must pass a test
Owners who live in the home can replace mechanical equipment with the same capacity and rating, and do limited plumbing, only after passing the Lake Saint Louis Homeowner Code Examination. Estates, trusts, buyers under contract and part-time rentals don't qualify.
Co-op electric area
Lake Saint Louis gets electricity from Cuivre River Electric Cooperative, not Ameren, so the co-op's heat pump water heater rebate is the local electric incentive.
Hard well water
PWSD #2 mixes water from its own wells with water bought from the City of St. Louis, and its 2025 report lists hardness up to 184 mg/L.
ENERGY & WATER
Who supplies Lake St. Louis homes.
Energy
- Electric: Cuivre River Electric Cooperative (Listed for Lake St. Louis by the Missouri PSC locator and the city's list of helpful numbers)
- Gas: Spire (The city lists Spire by its old name, Laclede Gas)
Missouri Public Service Commission – Utility Locator ↗ · Lake Saint Louis – Helpful Phone Numbers directory ↗
Water
St. Charles County Public Water Supply District #2 for most of the city; the city's water service provider map also shows an area served by the City of Wentzville: PWSD #2: 184 mg/L (about 10.8 gpg) highest carbonate hardness (range 142–184 mg/L) in September 2023 samples, reported in its 2025 Annual Water Quality Report
St. Charles County PWSD 2 – 2025 Annual Water Quality Report (MO6024530) ↗ · Lake Saint Louis – Water Service Providers map (PDF) ↗ · Missouri Public Service Commission – Utility Locator ↗
REBATES & CREDITS
Rebates for Lake St. Louis homes.
For Cuivre River Electric Cooperative and Spire customers in Lake St. Louis. Ask installers for the price before rebates, then check with the program that you qualify.
- Heat Pump Water Heater rebate ↗Active50% of the total cost, up to $750, for a heat pump water heater of 40 gallons or more.
- Missouri IRA Home Energy Rebates (HOMES and HEAR) ↗Not launchedMissouri expects about $76 million for HOMES and $75 million for electrification and appliance rebates.
- Federal Energy Efficient Home Improvement Credit (25C) ↗EndedCovered improvements made through December 31, 2025.
Checked September 30, 2026. Who qualifies and the conditions: Missouri rebates · How to check an incentive.
PERMITS & LICENSING
Permits and licenses in Lake St. Louis.
Permits and who issues them
Lake Saint Louis requires a permit to install or change plumbing and electrical systems, and its monthly permit reports show water heater replacements issued as home Mech/Elect/Plumb (MEP) permits. Apply and schedule inspections on the city's Citizenserve online portal, or request inspections by email.
Trade work must be done by contractors licensed in that trade. The homeowner policy names St. Charles County licenses for plumbers, electricians and mechanical contractors.
City of Lake Saint Louis Community Development, Building Division ↗ · Lake Saint Louis – Building Division ↗ · Lake Saint Louis – Updated Fee Table 3-1-2024 (PDF) ↗ · Lake Saint Louis – Homeowner-Occupant Conducting Their Own Work, Community Development Policy #7 (PDF) ↗ · Lake Saint Louis FAQ – Can I perform the work under the permit myself? ↗ · Lake Saint Louis – July 2026 Building Permits Issued (water heater replacements as MEP permits) ↗ · Lake Saint Louis – Basement Finish Guide (PDF) ↗
Check the installer’s license
Ask for the license number and search it yourself on the Missouri has no statewide plumbing license (check your city or county) ↗. A listing on Ember & Tank is not a license check. Missouri licensing explained →
NEARBY CITIES
Compare places near Lake St. Louis.
| City | Distance | Permit to replace | Fee | Electric |
|---|---|---|---|---|
| O'Fallon | 4 mi | Required | $50 | Ameren Missouri, Cuivre River Electric Cooperative |
| Dardenne Prairie | 5 mi | Check with city | — | Ameren Missouri, Cuivre River Electric Cooperative |
| Wentzville | 5 mi | Check with city | $35, | Ameren Missouri |
| St. Peters | 10 mi | Required | By job value (from $25) | Ameren Missouri, Cuivre River Electric Cooperative |
| Chesterfield | 14 mi | Required | $47 | Ameren Missouri |
| St. Charles | 15 mi | Required | $50 | Ameren Missouri |
COMMON QUESTIONS
Lake St. Louis water heater questions.
Do I need a permit to replace a water heater in Lake Saint Louis?
Yes. The city requires permits for plumbing and electrical work, and its permit reports list water heater replacements as home MEP permits. Apply on the Citizenserve portal.
Lake Saint Louis – Building Division ↗ · July 2026 Building Permits Issued ↗
How much is the permit?
An MEP permit is at least $50 plus at least $25 for plan review. Percentage-based fees apply only to bigger jobs (fee table effective March 1, 2024).
Can I replace it myself?
Only if you own and live full-time in a detached single-family home and pass the Lake Saint Louis Homeowner Code Examination. You still need a permit before work starts.
Is there a local rebate?
Cuivre River Electric Cooperative members can get 50% of the cost, up to $750, for a heat pump water heater of 40 gallons or more.
More guides: Missouri water heater replacement · All local guides