DDW-2025-005530

195 North 1950 West • Salt Lake City, UT Mailing Address: P.O. Box 144830 • Salt Lake City, UT 84114-4830 Telephone [phone] • Fax [phone] • T.D.D. [phone] www.deq.utah.gov Printed on 100% recycled paper
State of Utah

SPENCER J. COX Governor DEIDRE HENDERSON Lieutenant Governor
Department of Environmental Quality
Kimberly D. Shelley Executive Director
DIVISION OF DRINKING WATER Nathan Lunstad Ph.D., P.E. Director
February 19, 2025

Zachary Renstrom Washington County WCD – Sand Hollow 533 Waterworks Dr St George, UT 84770
Subject: Notice of Source Reactivation, Increased Monitoring Requirements for Washington County WCD – Sand Hollow, UTAH27073
Zachary Renstrom: According to the Division of Drinking Water’s (the Division) records, Washington County WCD – Sand Hollow recently reactivated the Sand Hollow Well 2 (identified as WS005) and the Sand Hollow Well Chlorinator (TP004). This reactivation changes the monitoring requirements for
this system. The monitoring requirements for the Sand Hollow Well 2 (WS005) are given below. An updated monitoring schedule can be viewed any time at waterlink.utah.gov under the Water Monitoring section.

Facility with new requirements Analyte(s) Required # of samples Sampling Frequency Next Due Date Rule Reference
WS005 Sand Hollow Well 2 Nitrate 1 Yearly 01/01/2025-12/31/2025 R309-205-5(4)(a)
Inorganics & Metals 1 Every three years 01/01/2026-12/31/2028 R309-205-5(3)(a)
Sulfate, Sodium, TDS 1 Every three years 01/01/2026-12/31/2028 R309-205-5(3)(a)
Radionuclides 1 Every three years 01/01/2026-12/31/2028 R309-205-7
Volatile Organic Contaminants 1 Every six years 01/01/2026-12/31/2031 R309-205-6(2)
Please contact David Kruse at (385)-566-7789 or [e-mail] for questions regarding the source monitoring and reporting requirements for your water system.
Zachary Renstrom Page 2 of 2
February 19, 2025
Disinfection Monitoring & Reporting Requirements The system must comply with the following disinfection monitoring and reporting requirements
as a result of reactivating the Sand Hollow Well #2 Chlorinator (TP004):
1) Chlorine Residual ‒ Point of Entry (POE) to Distribution System a) The POE sampling location is identified as EP004 in the Division’s database. The specific location will need to be provided to the Division. Maintain a minimum of 0.2 mg/L residual (measured as free chlorine) at the POE sampling location. [R309-215-
16(3)(b)(iii)(A)(I) and (II)]
b) The chlorine residual concentration measured at the POE sampling location shall not exceed the maximum residual disinfectant level (MRDL) of 4.0 mg/L (measured as free chlorine). [R309-200-5(3)(c)(iv)] c) Record and report the lowest daily chlorine residual concentration, measured as free
chlorine, at the chlorinator POE sampling location a minimum of daily. [R309-215- 10(1)] i) Our records show that your water system serves 425 people. Please be aware that R309-215-16(3)(b)(iii)(A)(II) requires water systems serving 3,300 people or fewer to monitor the POE chlorine residuals and take daily grab sample(s). Alternatively,
instead of taking daily grab samples, a groundwater system serving 3,300 or fewer people may choose to use an online analyzer to continuously monitor the POE chlorine residuals entering the distribution system.
Disinfection Report Submission To demonstrate ongoing compliance with secondary disinfection requirements, the water system
must complete monthly operational reports for each active chlorinator using a template approved
by the Division. The template can be found on the Division’s MRDL.utah.gov webpage.
• Operational reports are submitted quarterly. The reports are due to the Division by the 10th day following the end of each reporting month or quarter (i.e., January 10th,
April 10th, July 10th and October 10th for quarterly reports). The reports can be
submitted on the Division’s online form along with the distribution system chlorine residuals. The form can be found on the Division’s MRDL.utah.gov webpage.
Please contact Luke Treutel at [phone] or [e-mail] with any questions relating to disinfection monitoring and reporting.

Zachary Renstrom Page 2 of 2
February 19, 2025
Sincerely,
Mark Berger Monitoring and Standards Implementation Manager
cc: Zachary Renstrom, Washington County WCD – Sand Hollow, [e-mail] Jeremy Roberts, Southwest Utah Health Department, [e-mail] Paul Wright P.E., DEQ Southwest District Engineer, [e-mail] Mark Berger, Division of Drinking Water, [e-mail] David Kruse, Division of Drinking Water, [e-mail] Luke Treutel, Division of Drinking Water, [e-mail] [e-mail] [e-mail]