My house was built in 1983 and the septic is fine. I have it pumped every 4 or 5 years, but it’s sized for a 4 bedroom house and I live solo, so it has much more capacity than needed. I also am extremely careful about what gets flushed or put down the kitchen drain.

Since you're purchasing a home, I highly recommend getting an inspection done. The inspection will tell you if you need to be concerned, it's not just the age. I would honestly say not to buy a home without getting this inspected because it can turn out to be very costly.

Also, in my town they have outlawed a specific kind of older septic system and mandate that it needs to be replaced upon transfer of ownership.

A buyer should always ask for a septic inspection. A seller should always have the system pumped. Our 1979 system was in good shape and regularly pumped during our ownership from 1998 to 2016, when we found that the field was failing due to roots. We paid $12000 to have a new field.

My parents had a concrete tank that drained into a leech field. They built their house in 1962 and the original system was still going strong with zero issues when I sold their house a few years ago.

However, the caveat is that for all of that time it was a 2-3 person household, and the land is almost pure sand. The flip side is they almost never pumped it for the first few decades of its existence either.

40 years old in our last house - nonconforming but pumped every two years and functioning without problems. The home never had more than two residents which was a plus. When we sold the buyer wanted an inspection but we advised that an inspection would formalize the fact that it was non-conforming and the wooded lot would be decimated to put in a new, unnecessary septic but for new city regulations. Buyer asked for service company contact to verify maintenance and ultimately accepted it without an inspection. A second buyer recently apparently agreed as well as there is no new septic on the property. Proper use and regular maintenance can sustain a septic system for many, many years.

@3katz4me we had it inspected and it passed. only noted some corrosion at the outlet baffle. apparently its a 1500 gal septic with a 750 gal leeching pit. they said its been pumped every 3 years maybe. there were 3 people in the house . hoping it has a good while longer since these systems are so pricey to replace. weve been really nervous about a 35yr old system

Ours was installed in 1952, so that's 70 years. It gets pumped regularly and was inspected and re-certified by the town when we bought the house 9 years ago. I was surprised as most systems that old don't pass the Title V requirements in MA.

When I sold my 1895 Long Island house last year, we had been living in it for 30 years. It has been pumped only once during that time. It was a concrete tank with an overflow tank, to which we added an additional set of rings at the time that it was pumped. I don't know when it was installed, but I'm pretty sure it was substantially later than 1895, so I don't know how old it is.

My previous house was built in 1967-69 (records were vague). The septic system lasted until I sold the place in 2019. Except the portion I think they called the "transfer box". In the 25 years I was there, I had the thing pumped every 3-5 years (depending on if it was just me or if I also had housemates). No idea what the previous owners did. The transfer box DID collapse one day around 2010, when I was walking across the lawn over it.... fortunately, I was not injured, but yeah, that was toxic slurp I was nearly half a leg into!!!

I had this dug up and replaced - can't recall how much I paid. Probably around 1K or a little less.

Basically, what I'm saying is that when they pump out your septic tank, they're not going to have any idea of the condition of your septic system AFTER the stuff leaves the tank to go further downhill before it reaches your leaching field! If your home is young enough (younger than THAT house), you should be able to get an entire septic/leeching site plan.

EDIT: It's called the Distribution Box. Check this link =. Septic Schematics

Our house in NY had a septic. It was built in 1952. It had large fields on both sides of the property. We had a pumped every two years. We lived there 45 yrs. Never had a problem.

Sold the house 10 yrs ago. Buyers had it inspected and it passed.

Jane

My house in CT was built in 1979 with septic system. Regularly cleaned every 3 years. No teenagers in the house!!

Buyer had it inspected, and it passed with excellent comments from inspector.

So - these systems can last more than forty years if well maintained.

43 years.

It's a crapshoot. We had friends who bought a ten year old house recently that needed a new septic. We have probably a thirty year old septic that is going strong.