PATIENT PORTAL. More. Nith Valley Family Practice. 10 Waterloo Street, Unit 1. New Hamburg, ON N3A 1V5. 519-662-1551. PATIENT PORTAL. The Patient Portal is Coming Soon! Nith Valley Family Practice. 10 Waterloo Street, Unit 1. New Hamburg, ON N3A 1V5. For Life-Threatening Emergencies Call 911 ....