| Business | Phone |
| Water Technology Inc 201 E Park St C, Mundelein 60060 | (847) 949-1512 |
| Chicago Control Systems Inc 89 S Windsor Pl, Mundelein 60060 | (847) 247-8021 |
| Christopher B Burke Engineerng 1681 Verde Ln, Mundelein 60060 | (847) 837-1810 |
| Control Systems Inc 226 Terrace Dr, Mundelein 60060 | (847) 970-7955 |
| In Scope Engineering 240 Banbury Rd, Mundelein 60060 | (847) 949-5196 |