Lake Saint Louis property tax: where it goes
A typical Lake Saint Louis house pays about $5,410 a year on the property tax bill, including flat charges on the same bill. Estimated from public rates, not anyone's actual bill.
A Lake Saint Louis house pays 6.976% of its taxable value in property tax, plus flat charges on the same bill. For a house at $77,121 of value before exemptions, that's about $5,408 a year.
Tax is levied on Residential property is assessed at 19 percent of its true value in money. Rates are per $100 of assessed valuation..
The county's 2026 tax rate chart was not published when checked; the 2025 chart is the latest.
Pay or manage it
Who taxes this house
| Taxing agency | Rate | On $77,121 |
|---|---|---|
| City of Lake Saint Louis | 0.391% | $302 |
| State of Missouri | 0.03% | $23 |
| St. Charles County road and bridge | 0.1687% | $130 |
| St. Charles County library | 0.1668% | $129 |
| St. Charles County ambulance | 0.3175% | $245 |
| St. Charles County developmental disability | 0.1068% | $82 |
| St. Charles County dispatch and alarm | 0.0324% | $25 |
| Wentzville R-IV School District (schools) | 4.5359% | $3,498 |
| St. Charles Community College | 0.1569% | $121 |
| Lake St. Louis Fire Protection District | 1.0704% | $826 |
| Water service line insurance assessment | flat | $8 |
| Sewer lateral insurance assessment | flat | $20 |
| Total | 6.976% | $5,408 |
2025 tax year, St. Charles County (Wentzville R4 school code 15, city of Lake St Louis).
Ways to pay less
- Seniors 62+: County property tax relief credit. St. Charles County residents at least 62 years old and living at the property as of Jan. 1, 2026 can apply for a credit on their tax bill. How: Apply or renew every year.
- Water service line insurance. Most residential properties are covered by a water service line program with an $8 annual assessment paid with real estate taxes. How: Call Public Works at 636-695-4221 if you suspect a leak in your water service.
- Sewer lateral insurance. The sewer lateral program costs $20 for an annual assessment paid with real estate taxes and covers repairs from the exterior building foundation wall to the public sewer. How: See the city's Sewer Lateral Insurance page.
Dates
| When | What |
|---|---|
| Dec 31: Real estate tax bills due (in 56 days) | Tax bills are mailed by Dec. 1. Tax payments are due Dec. 31. |
Sources
- County combination tax rate chart
- City code ch. 625 gross receipts tax
- State definitions (assessment ratio)
- County assessments and taxes
Checked October 31, 2026. Every number here comes from the public sources listed, matched by our checker.
Rates change every year; this page shows when it was last checked. Nothing here is legal, tax or insurance advice.
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