No, you can not deduct the replacement of your sewer.
Repairs, maintenance, and improvements to your personal residence property are not deductible on your tax return.. If you make major improvements which increase your home’s market value or extend its useful life, you can add the cost of the improvements to the cost basis of your home, and you get the benefit when you sell. Improvements increase your value and basis of the property.
You might find it helpful to read IRS Pub. 530, Tax Information for Homeowners
http://www.irs.gov/pub/irs-pdf/p530.pdf
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