One of my properties in Euclid, OH received a violation from the city during the inspection last year:"The cellar/basement walls show signs of leakage and/or accumulation of moisture. 

Such as the roof needs to be completely replaced (there is a ridge sag and seems it could fail, rafters aren't place correctly), the porch needs a larger joist as its sagging down as well, the basement still has asbestos, the basement needs waterproofing as there is a moldy smell and minor water leakage, barely update the 1st floor unit, update and correct the electrical (relocate a fuse panel in a bathroom), brand new panels in the basement with a larger feed coming in, concrete steps in front and rear of house are in need of some repair, the boilers may need to be replaced, replace a few broken windows(completely shattered, just a piece of plywood covers them now), the lower roof gutters were nailed directly into the shingles, there are no GFCI's in any bathroom or kitchen, and a few other fixes.It would be an FHA 203k with 3.5% down$9,600 per year in taxesGarbage is included in taxes, tenants pay gas and electric, owner pays waterThe 1st floor unit is a 2/1 rented for $1225, they have exclusive use of driveway, backyard and the basement. 2nd/3rd floor unit is listed as 3/1, however there is 2 bedrooms on the 3rd floor with a bathroom.

Pretty low, I would guess, but you may still have a septic company inspect it and verify.If it is a legitimate concern, you should be able to install a barrier or something similar to a french drain to catch any leakage before it reached your home.

You probably are installing an angle stop with a compression fitting, so a small amount of leakage won't interfere with your installation.

My just got a condo late March this year, and early May the condo association told me there was a leakage in my kitchen faucet / garbage disposal that led to water leakage in the units underneath me (two units since the middle unit is vacant and they didn't realize).

Depending on the area, the city/county health inspector may actually choose to be there for the removal (not fun), but in our cases there was no leakage.

And some fiberglass or,  better, rockwool insulation to fill up weight cavities in old sash windows.I know the salesman who came out and carefully measured your windows before giving you a quote offered you a careful spiel about thousands of dollars of possible leakage and damage and insurance and a bunch of other vague warnings.

A basement may be used for habitable rooms or a dwelling unit, regardless of the depth of the floor below grade, if the floors and walls are impervious to leakage of underground and surface water and are protected from dampness, and if the required minimum 13-172-130, or by other approved means. 13-172-070 Natural light.

Check your roof and windows for signs of leakage.  

Suction PressureDischarge PressureDuct leakage?