PURPOSE: This rule sets forth procedures and requirements for requesting and granting variances for any size of public water system.

1. (1) Conditions of Variance. The department may grant one (1) or more variances to any public water system from any maximum contaminant level (MCL) requirement, except for those MCL violations that present an acute, short-term risk to public health, and any specified treatment technique.

   1. (A) A variance from an MCL may be granted to a public water system upon a finding that, due to characteristics of raw water sources which are reasonably available, the system cannot meet the MCL requirement—

      1. 1. On the condition that the system

installs the best available technology, treatment techniques or other means, which the department, taking cost into consideration, finds generally available and based upon an evaluation satisfactory to the department that indicates that alternative sources of water are not reasonably available to the system; and

1. 2. The granting of a variance will not

result in an unreasonable risk to persons served by the system.

1. (B) A variance from a specified treatment technique may be granted upon a finding that a public water system applying for this variance has demonstrated that the treatment technique is not necessary to protect persons served by the system because of the nature of the raw water source. A variance granted under this subsection (1)(B) shall be conditioned on such monitoring and other requirements as the department may prescribe.

1. (2) Variance Request. A supplier of water seeking a variance shall submit a written request to the department. Suppliers of water may submit a joint request for a variance when they seek similar variances under similar circumstances. Any written request for a variance shall include the following information:

   1. (A) The nature and duration of the variance requested;
   2. (B) Relevant analytical results of water quality sampling of the system including sampling of raw water relevant to the variance request;
   3. (C) Full discussion with supporting data regarding the best available treatment technology and techniques including evidence of the inability of the system to comply;
   4. (D) Economic and legal factors relevant to ability to comply;
   5. (E) A proposed compliance schedule, including the date each step toward compliance will be achieved;
   6. (F) The date by which the connection with an alternative water source or an improvement of an existing raw water source will be initiated;
   7. (G) The date by which an arrangement for an alternative water source or improvement of an existing raw water source will be completed;
   8. (H) The date by which final compliance is to be achieved;
   9. (I) A plan for the provision of safe drinking water should there be an excessive rise in the contaminant level for which the variance is requested;
   10. (J) A plan for interim control measures during the effective period of variance;
   11. (K) Any request made under the provisions of this rule shall include, as a condition of the variance, a statement that the system will perform monitoring and other reasonable requirements prescribed by the department;
   12. (L) Any other information the applicant believes to be pertinent; and
   13. (M) Other information as the department may require.

2. (3) Consideration of a Variance Request.

   1. (A) In considering whether the public

water system is unable to comply with a contaminant level requirement because of the nature of the raw water source, the department shall review factors it considers relevant, including the following:

1. 1. The availability, effectiveness and

reliability of treatment methods for the contaminant for which the variance is requested;

1. 2. Cost and other economic considera-

tions in implementing treatment, improving the quality of the source of water or using an alternate source;

1. 3. Characteristics of the raw water

source(s);

1. 4. Availability of an alternative water

source; and

1. 5. Risk to health.

2. (B) In considering whether the public water system should be granted a variance to a required treatment technique because the treatment is unnecessary to protect the public, the department shall consider the following factors: 10 CSR 60-6

   1. 1. Quality of the water source including

water quality data and pertinent sources of pollution; and

1. 2. Susceptibility of the source to con-

tamination and the source protection measures employed by the public water system.

1. (4) Disposition of a Request for Variance.

   1. (A) If the department determines that a request for a variance is inadequate or incomplete, it may deny the request.

   2. (B) If the department proposes to grant a variance request—

      1. 1. The department shall provide notice

and opportunity for public hearing on the proposed variance as specified in 10 CSR 60- 6.040. The notice and hearing may cover more than one proposed variance;

1. 2. The department shall notify the appli-

cant of its decision in writing. The notice shall identify the variance, the facility covered and shall specify, as appropriate, the period of time for which the variance will be effective;

1. 3. For a variance from an MCL, the

notice also shall provide that the variance will be terminated when the system comes into compliance with the applicable rule and may be terminated upon a finding by the department that the system has failed to comply with any requirements of a final schedule issued pursuant to 10 CSR 60-6.030; and

1. 4. For a variance from a specified treat-

ment technique, the notice shall provide for termination of the variance at any time based upon a finding that—

1. A. Due to the nature of a raw water

source, the specified treatment technique required by the variance is necessary to protect persons; or

1. B. The public water system has failed

to comply with monitoring and other requirements prescribed by the department as a condition to the granting of the variance.

AUTHORITY: sections 640.100 and 640.120, RSMo Supp. 1998.* Original rule filed May 4, 1979, effective Sept. 14, 1979. Amended: Filed April 14, 1981, effective Oct. 11, 1981. Amended: Filed June 2, 1988, effective Aug. 31, 1988. Amended: Filed Dec. 4, 1990, effective July 8, 1991. Amended: Filed Feb. 1, 1996, effective Oct. 30, 1996. Amended: Filed July 1, 1999, effective March 30, 2000.

*Original authority: 640.100, RSMo 1939, amended 1978, 1981, 1982, 1988, 1989, 1992, 1993, 1995, 1996, 1998, 1999; 640.120, RSMo 1978, amended 1989, 1992, 1998.