** Xylem's shares XYL.N fall 1.2% to $135.95 premarket
** Brokerage TD Cowen downgrades rating on company's shares
to "hold" from "buy", maintains PT of $138
** Xylem makes water as well waste-water treatment products
** Growth in company's revenue and margins are decelerating
on lower spending in the U.S. on infrastructure - brokerage
** 13 brokerages rate the stock "buy" or higher, 8 "hold";
median PT $160 - LSEG
** Stock up 20.3% YTD as of last close
(Reporting by Aatreyee Dasgupta)
((Aatreyee.Dasgupta@thomsonreuters.com))