How can Markham buyers check flood risk and protect a basement?Markham’s 2026 budget includes $34.5 million for flood control, stormwater construction, ponds and culverts, funded partly by a residential stormwater fee on the tax bill. Homeowners can apply for up to $1,750 toward an indoor backwater valve in eligible areas, with pre-approval. Before buying, ask about past water, check for a backwater valve and sump pump, and confirm sewer backup and overland flood coverage.
Heavy summer storms have made basement flooding a bigger concern for GTA buyers, and insurance has become more detailed about it.
Michael John Lau, a REALTOR® with the Kaizen Real Estate Team, one of the most active real estate teams in Markham and York Region, adds basement protection to every buyer’s inspection list.
What the City is doing
| Item | Detail |
|---|---|
| 2026 flood and stormwater budget | $34.5 million |
| Stormwater fee | Per residential property, on the tax bill, since 2020 |
| Flood Control Program | Long-term upgrades to reduce surface and basement flooding |
Protection to look for
- A backwater valve on the main sewer line
- A working sump pump, ideally with a battery backup
- Downspouts directed away from the foundation
- Grading that slopes away from the house
Markham’s Private Plumbing Protection Rebate offers up to $1,750 for an indoor backwater valve in eligible areas, with pre-approval before work starts.
Questions for the seller
- Has the basement ever had water?
- Were any insurance claims made?
- Is there a backwater valve, and when was it installed?
- Has the sump pump been replaced?
Worried about a basement?
Michael John Lau can help you build flood questions into your offer and inspection.
Book a buyer consultationSearch Markham homesPrefer to talk? Call the Kaizen Real Estate Team at (647) 370-8885.
Insurance
Sewer backup and overland flood coverage are often optional add-ons. Get a quote on the specific address before your conditions expire, and ask whether a backwater valve affects the premium or deductible.
Ravine and creek lots
Homes near watercourses may also be in a TRCA regulated area, which has its own rules for changes to the land. Ultimately, the decision is yours. The goal is to make sure you have all the information before you offer.
A dry basement starts with the right questions. Call the Kaizen Real Estate Team at (647) 370-8885 or book a consultation.
Frequently asked questions
How much is Markham spending on flood control?
$34.5 million in the 2026 budget for flood control, stormwater, ponds and culverts.
Is there a backwater valve rebate in Markham?
Yes, up to $1,750 for an indoor valve in eligible areas, with pre-approval.
What is Markham's stormwater fee?
A per-property charge on the residential tax bill that funds the Flood Control Program.
Does home insurance cover basement flooding?
Often only with sewer backup or overland flood add-ons. Ask your insurer.
What should I ask a seller about flooding?
Past water, claims, backwater valve and sump pump details.
Does a TRCA regulated area mean flood risk?
Not always, but low-lying lots near watercourses can carry more risk.
Michael John Lau and Neeraj Moolchandani are licensed REALTORS® with the Kaizen Real Estate Team, eXp Realty, Brokerage, 9763 Markham Rd, Markham, ON L6E 1A4. Licence #4784577. Call (647) 370-8885. The $34.5 million figure is from the City of Markham Budget 2026 release (October 31, 2025). Stormwater fee details are from the City's Flood Control Program page. The rebate is from the City's Private Plumbing Protection Rebate. Confirm eligibility with the City. This article is general information only and is not financial, legal or tax advice. Not intended to solicit buyers or sellers currently under contract with another brokerage.
