Sirens in Waukesha County, with the exception of the City of Waukesha, are tested every Wednesday at 2PM from SWA (April)-September, second Wednesday at 2PM from September-SWA (April). Sirens in the City of Waukesha are tested every Friday at 9:30AM.
Big Bend - Yellow STH-10
Butler - T-128
City of Brookfield - 2T22, STH-10, a few 508s and 2001s.
Eagle - Whelen 3000 and replaced HPSS-16R
Elm Grove - Steel horn T-121s and a 1003
Lannon - Very low roof mounted T-121
Menomonee Falls - A bunch of T-128s that replaced a T-128 and multiple RM-130s.
Merton - Model 5
Muskego - Many T-128s and an inactive Model 2
New Berlin - Multiple T-128s
North Lake - Model 5
Okauchee Lake - STL-10
Pewaukee - 508 and M-5 for backup.
Sussex - 508s, 2001s and 2 Banshees
Town of Brookfield
Waukesha - Many T-128s