On O’Fallon Quality Drainage, city paper is part of drainage even when the job looks like a backyard ditch. Read O’Fallon Engineering yourself. This note is a pointer, not a permit determination and not legal advice.
Confirm grading and land-disturbance review first
Before importing fill, changing a water path, or proposing a public tie-in, check the current O’Fallon Engineering and Building Permits requirements for the parcel
Before importing fill, changing a water path, or proposing a public tie-in, check the current O’Fallon Engineering and Building Permits requirements for the parcel. Permit needs can vary by location and scope. Confirm them instead of relying on a quantity rule copied from a blog.
See yard grading for the construction side of that question.
The City MS4 program is not a backyard permit shortcut
O’Fallon’s 2021-2026 Phase II MS4 permit describes municipal stormwater-program obligations
O’Fallon’s 2021-2026 Phase II MS4 permit describes municipal stormwater-program obligations. It does not decide whether a particular backyard project is approved, exempt, or connected to a public system. Ask the city how the proposed release relates to its system.
Commercial parking work is more likely to touch these rules. See commercial yard drainage.
Storm connections are not DIY defaults
Tying private pipe to a public inlet without approval is not a hack
Tying private pipe to a public inlet without approval is not a hack. It is how a small job becomes a removal order. Name daylight, pop-up, or an approved connection. Nothing else.
Missouri 811 at missouri811.org marks public utilities. It does not grant storm-tap permission.
Other cities in this cluster
St. Peters, Dardenne Prairie, Wentzville, and the rest have their own desks
St. Peters, Dardenne Prairie, Wentzville, and the rest have their own desks. O’Fallon paper does not travel. Chesterfield adds a levee district on valley parcels.
How to use this in a request
In contact, say whether you expect imported fill, a public storm tap, or only on-lot daylight
In contact, say whether you expect imported fill, a public storm tap, or only on-lot daylight. Attach a sketch. A provider still confirms the current application.
Pair this note with French drain installation so the trench and the paper stay in one file.
A permit-contact checklist that avoids guessing
Before calling or submitting anything, prepare the street address, a simple drawing of the existing and proposed water path, approximate limits of disturbance, photographs of the low point, and any survey or prior plan the owner has
Before calling or submitting anything, prepare the street address, a simple drawing of the existing and proposed water path, approximate limits of disturbance, photographs of the low point, and any survey or prior plan the owner has. Ask O’Fallon Engineering which review path applies to that scope, whether a grading or land-disturbance question is involved, and whether a public-system connection, easement, or floodplain issue changes the answer.
Use the answer for that parcel and date, not as a universal rule for another address. If the work is outside O’Fallon, begin again with that city. A contractor’s service area or a similar-looking subdivision does not transfer city approval. Keep the response, contact name, and any referenced form with the project packet.
Distinguish an on-lot outlet from a public connection
An on-lot daylight or emitter still needs a route that does not direct water onto a neighbor, sidewalk, or feature the owner does not control
An on-lot daylight or emitter still needs a route that does not direct water onto a neighbor, sidewalk, or feature the owner does not control. A proposed public connection requires city direction. A nearby curb inlet is not an invitation, and Missouri 811 marking is not permission to connect. Write the outlet type and ownership question into the estimate before comparing installation options.
For a larger or more complex project, include access and restoration questions as well: gates, paving, utility locations, spoil placement, landscape repair, and first-rain observation. These items do not decide whether a permit is required, but they prevent a narrow trench price from hiding a wider site impact.
Keep the closeout record useful
After the work, retain approved documents where applicable, the as-built route if known, before-and-after photographs, and the date of the first meaningful rain observation
After the work, retain approved documents where applicable, the as-built route if known, before-and-after photographs, and the date of the first meaningful rain observation. If the drainage path does not behave as expected, that record gives the property owner and provider something concrete to review. It is not a substitute for municipal direction or legal advice.
What a complete O’Fallon request contains
Include the address, the visible water source, photos after rain, a rough drawing of the proposed work, and a clear statement about whether the question involves only private on-lot drainage or a possible public feature
Include the address, the visible water source, photos after rain, a rough drawing of the proposed work, and a clear statement about whether the question involves only private on-lot drainage or a possible public feature. If imported fill, a changed grade, a curb, an easement, or a public inlet appears in the plan, state that directly when contacting Engineering.
The answer can be recorded alongside the proposal. That makes it easier to distinguish city guidance from a contractor estimate and avoids turning a dated webpage into a legal conclusion for a different parcel.
Read a City response against the actual scope
When the City responds, compare the response with the actual drawing before treating it as a green light
When the City responds, compare the response with the actual drawing before treating it as a green light. Check the address, the stated outlet, the amount and location of any imported material, the planned disturbance, and whether a curb, easement, or public feature appears in the route. A reply about a wholly on-lot grade adjustment may not cover a later request to cross a utility easement or connect to a storm feature.
Keep the response with the contractor scope, but do not turn it into a promise about a different parcel or a later design change. The estimate should still identify private utility locating, access, spoil handling, restoration, and who will observe the first meaningful rain. Those construction questions are separate from the City’s determination, and spelling them out keeps permit review from being mistaken for a complete installation plan.
Recheck when the scope changes
If the route, outlet, imported material, or public feature changes, ask Engineering again
If the route, outlet, imported material, or public feature changes, ask Engineering again. A prior answer may not apply to a materially different plan.
For closeout, keep the approved route, contact notes, and rain photographs with the property file. A later repair can then start from the recorded scope rather than a remembered conversation.
Check O'Fallon Engineering before the trench looks simple questions
01Do I need grading review before importing fill?
Confirm the current Engineering and Building Permits path for the address and scope before work.
02Does a small French drain always need a permit?
Not always. Fill quantity, storm taps, and floodplain status can change the answer. Ask the city.
03What is the City MS4 program?
It is the City's stormwater program. It does not replace a parcel-specific permit or connection review.
04Is this legal advice?
No. The authority having jurisdiction decides.
05Do nearby towns use the same form?
No. Each city has its own contacts.