You would have been notified that the house is on a septic system, and been required to get it inspected. You also would have been required to have it pumped if it hadn't been pumped in the last few years. So it's unlikely that your house is on a septic system if none of those things happened.
AusRenovation
I wasn't notified. I have sent an email to the council asking if they know anything.
Septic tank should not smell. If your house have indeed a septic system then look at your water bills, there should not be charge for sewage. Also it is very important to take care of your septic tank.
Haven't received the water bill yet. How do we update the details and remove the previous owners name ?
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Others are right about septic disclosure but let's say there was an oversight: you can try searching your state's Department of Health records for septic as-builts, old inspections, or if it was decommissioned. Usually search by parcel number.
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Hm, it happening when it is windy sounds like something might be involving the plumbing vents? I'd have a plumber inspect the system.
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I had a similar problem. Turns out it was a broken seal on a toilet and the toilet was leaking into the space below.
Toilet seal is def not the problem. I called a plumber once and he said he can't smell anything and charged me $200. The issue is the smell is not present all the time.
Could it be environmental? Any creeks, stormwater drains or water treatment plants nearby?
I live in inner Melbourne and sometimes when the wind is coming in the right direction the area just stinks.
Maybe there's an empty siphon somewhere from a drain you don't use often? Try putting some water in all of your drains.
I spend $200 bucks on a plumber for 20mins and he said everything is fine. The issue is sometimes it smells and sometimes it doesn't.