The department shall classify water distribution systems into one of 5 grades based on the population served, as specified in Table 502-4, below:

Table 502-4: Grades of Water Distribution System Complexity

Grade

Population Served (# people unless otherwise noted)

Other Limitations

I-A

< 500 or < 200 service connections

CWS without fire protection

I-A

Any number

NTNC without fire protection

I

≤ 1,500

Excluding I-A systems

II

1,501 – 15,000

None

III

15,001 - 50,000

None

IV

≥ 50,001

None

Source. (See Revision Note at part heading for Env-Dw 502) #9410, eff 3-12-09 (formerly Env-Ws 367.10); ss by #12363, eff 8-19-17 (formerly Env-Dw 502.14)