(415 ILCS 5/17) (from Ch. 111 1/2, par. 1017)
    Sec. 17. Rules; chlorination requirements.
    (a) The Board may adopt regulations governing the location, design, construction, and continuous operation and maintenance of public water supply installations, changes or additions which may affect the continuous sanitary quality, mineral quality, or adequacy of the public water supply, pursuant to Title VII of this Act.
    (b) The Agency shall exempt from any mandatory chlorination requirement of the Board any community water supply which meets all of the following conditions:
        (1) The population of the community served is not
more than 5,000;
        (2) Has as its only source of raw water one or more
properly constructed wells into confined geologic formations not subject to contamination;
        (3) Has no history of persistent or recurring
contamination, as indicated by sampling results which show violations of finished water quality requirements, for the most recent five-year period;
        (4) Does not provide any raw water treatment other
than fluoridation;
        (5) Has an active program approved by the Agency to
educate water supply consumers on preventing the entry of contaminants into the water system;
        (6) Has a certified operator of the proper class, or
is an exempt community water supply, under the Public Water Supply Operations Act;
        (7) Submits samples for microbiological analysis at
twice the frequency specified in the Board regulations; and
        (8) A unit of local government seeking to exempt its
public water supply from the chlorination requirement under this subsection (b) on or after September 9, 1983 shall be required to receive the approval of the voters of such local government. The proposition to exempt the community water supply from the mandatory chlorination requirement shall be placed on the ballot if the governing body of the local government adopts an ordinance or resolution directing the clerk of the local government to place such question on the ballot. The clerk shall cause the election officials to place the proposition on the ballot at the next election at which such proposition may be voted upon if a certified copy of the adopted ordinance or resolution is filed in his office at least 90 days before such election. The proposition shall also be placed on the ballot if a petition containing the signatures of at least 10% of the eligible voters residing in the local government is filed with the clerk at least 90 days before the next election at which the proposition may be voted upon. The proposition shall be in substantially the following form:
    Shall the community
water supply of ..... (specify     YES
the unit of local government)
be exempt from the mandatory    ------------------------------
chlorination requirement            NO
of the State of Illinois?
    If the majority of the voters of the local government voting therein vote in favor of the proposition, the community water supply of that local government shall be exempt from the mandatory chlorination requirement, provided that the other requirements under this subsection (b) are met. If the majority of the vote is against such proposition, the community water supply may not be exempt from the mandatory chlorination requirement.
    Agency decisions regarding exemptions under this subsection may be appealed to the Board pursuant to the provisions of Section 40(a) of this Act.
    (c) Any supply showing contamination in its distribution system (including finished water storage) may be required to chlorinate until the Agency has determined that the source of contamination has been removed and all traces of contamination in the distribution system have been eliminated. Standby chlorination equipment may be required by the Agency if a supply otherwise exempt from chlorination shows frequent or gross episodes of contamination.
(Source: P.A. 98-78, eff. 7-15-13.)