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Water 100 plus 1 year performing duties of an operator while holding an OIT certificate – Grade I Wastewater certification exam

Water 105 & Water 107 plus either high school diploma or equivalent and 2 years performing duties of an operator while holding a certificate OR plus 1 ½ years working in operations while holding a Grade I WWTP operator certificate – Grade II Wastewater certification exam

Water 112 & Water 107 plus AS Degree or 60 college semester units including 15 semester units of basic science courses and 2 years performing duties of an operator while holding a certificate OR plus high school diploma or equivalent and 16 educational points and 4 years performing duties of an operator while holding a certificate OR plus 3 years working in operations while holding a Grade II WWTP operator certificate – Grade III Wastewater certification exam

Water 121 – Grade I Collection System Maintenance certification exam

Water 120 plus high school diploma or equivalent – D1 certification exam

Water 120 plus high school diploma or equivalent – D2 certification exam

Water 120 & Water 107 plus a valid D2 operator certificate, 1 year working as a D2 operator and 1 year as a distribution operator – D3 certification exam

Water 104, Water 106, Water 107, & Water 120 plus a valid D3 operator certificate, 1 year working as a certified D3 or interim D4 operator and 3 additional years as a water distribution operator – D4 certification exam

Water 104 – Grade I (T1) Water Treatment Operator and Grade II (T2) Water Treatment Operator certification exams

Water 108 plus (depending upon education) six months to two years of in-plant experience (education or an internship can be substituted for in-plant experience) – Grade III (T3) Water Treatment Operator certification exam