NL Cypress-CS070824: Tcxas Administrative Code
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TITLE 30
PART 1
CHAPTER 290
SUIRCHAPTER._D
RULE §290.45
(a) General provisions.
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ENVIRONMENTAL QUALITY
TEXAS COMMISSION ON ENVIRONMENTAL QUALITY
PUBLIC DRINKING WATER
RULES AND REGULATIONS FOR PUBLIC WATER
SYSTEMS
Minimum Water System Capacity Requirements
(1) The requirements contained in this section are to be used in evaluating both the total capacities for
public water systems and the capacities at individual pump stations and pressure planes which serve
portions of the system that are hydraulically separated from, or incapable of being served by, other
pump stations or pressure planes. The capacities specified in this section are minimum requirements
only.
(2) The executive director will require additional supply, storage, service pumping, and pressure
maintenance facilities if a normal operating pressure of 35 pounds per square inch (psi) cannot be
maintained throughout the system, or if the system's maximum daily demand exceeds its total
production and treatment capacity. The executive director will also require additional capacities if the
system is unable to maintain a minimum pressure of 20 psi during fire fighting, line,flushing, and other
unusual conditions.
(3) The executive director may establish additional capacity requirements for a public water system
using the method of calculation described in subsection (g)(2) of this section if there are repeated
customer complaints regarding inadequate pressure or if the executive director receives a request for a
capacity evaluation from customers of the system.
(4) Throughout this section, total storage capacity does not include pressure tank capacity.
(5) The executive director may exclude the capacity of facilities that have been inoperative for the past
120 days and will not be returned to an operative condition within the next 30 days when determining
compliance with the requirements of this section.
(6) The capacity of the treatment facilities shall not be less than the required raw water or groundwater
production rate or the anticipated maximum daily demand of the system.
(b) Community water systems.
(1) Groundwater supplies must meet the following requirements.
(A) If fewer than 50 connections without ground storage, the system must meet the following
requirements:
(1) a well capacity of 1.5 gallons per minute (gpm) per connection; and
(ii) a pressure tank capacity of'50 gallons per connection. CBP02850
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(B) If fewer than 50 connections with ground storage, the system must meet the following
requirements:
(i) a well capacity of 0.6 gpm per connection;
(ii) a total storage capacity of 200 gallons per connection;
(iii) two or more service pumps having a total capacity of 2.0 gpm per connection; and
(iv) a pressure tank capacity of 20 gallons per connection.
(C) For 50 to 250 connections, the system must meet the following requirements:
(i) a well capacity of 0.6 gpm per connection;
(ii) a total storage capacity of 200 gallons per connection;
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(iii) two or more pumps having a total capacity of 2.0 gpm per connection at each pump station or
pressure plane. For systems which provide an elevated storage capacity of 200 gallons per connection,
two service pumps with a minimum combined capacity of 0.6 gpm per connection are required at each
pump station or pressure plane. If'only wells and elevated storage are provided, service pumps are not
required; and
(iv) an elevated storage capacity of 100 gallons per connection or a pressure tank capacity of 20
gallons per connection.
(D) For more than 250 connections, the system must meet the following requirements:
(i) two or more wells having a total capacity of 0.6 gpm per connection. Where an interconnection
is provided with another acceptable water system capable of supplying at least 0.35 gpm for each
connection in the combined system under emergency conditions, an additional well will not be required
as long as the 0.6 gpm per connection requirement is met for each system on an individual basis. Each
water system must still meet the storage and pressure maintenance requirements on an individual basis
unless the interconnection is permanently open. In this case, the systems' capacities will be rated as
though a single system existed;
(ii) a total storage capacity of 200 gallons per connection;
CBP02851
(iii) two or more pumps that have a total capacity of 2.0 gpm per connection or that have a total
capacity of at least 1,000 gpm and the ability to meet peak hourly demands with the largest pump out of
service, whichever is less, at each pump station or pressure plane. For systems which provide an
elevated storage capacity of 200 gallons per connection, two service pumps with a minimum combined
capacity of 0.6 gpm per connection are required at each pump station or pressure plane. If only wells
and elevated storage are provided, service pumps are not required;
(iv) an elevated storage capacity of 100 gallons per connection or a pressure tank capacity of 20
gallons per connection. If pressure tanks are used, a maximum capacity of 30,000 gallons is sufficient
for up to 2,500 connections. An elevated storage capacity of 100 gallons per connection is required for
systems with more than 2,500 connections. Alternate methods of pressure maintenance may be
proposed and will be approved if the criteria contained in subsection (g)(5) of this section are met; and
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(v) emergency power for systems which serve more than 250 connections and do not meet the
elevated storage requirement. Sufficient emergency power must be provided to deliver a minimum of
0.35 gpm per connection to the distribution system in the event of the loss of normal power supply.
Alternately, an emergency interconnection can be provided with another public water system that has
emergency power and is able to supply at least 0.35 gpm for each connection in the combined system.
Emergency power facilities in systems serving 1,000 connections or greater must be serviced and
maintained in accordance with level 2 maintenance requirements contained in the current National Fire
Protection Association (NFPA) 11.0 standards. Although not required, compliance with NFPA 110
standards is highly recommended for systems serving less than 1,000 connections. Logs of all
emergency power use and maintenance must be maintained and kept on file for a period of not less than
three years. These records must be made available, upon request, for executive director review.
(E) Mobile home parks with a density of eight or more units per acre and apartment complexes
which supply fewer than 100 connections without ground storage must meet the following
requirements:
(i) a well capacity of 1.0 gpm per connection; and
(ii) a pressure tank capacity of 50 gallons per connection with a maximum of 2,500 gallons
required.
(F) Mobile home parks and apartment complexes which supply 100 connections or greater, or fewer
than 100 connections and utilize ground storage must meet the following requirements:
(i) a well capacity of 0.6 gpm per connection. Systems with 250 or more connections must have
either two wells or an approved interconnection which is capable of supplying at least 0.35 gpm for
each connection in the combined system;
(ii) a total storage of 200 gallons per connection;
(iii) at least two service pumps with a total capacity of 2.0 gpm per connection; and
(iv) a pressure tank capacity of 20 gallons per connection.
(2) Surface water supplies must meet the following requirements:
(A) a raw water pump capacity of 0.6 gpm per connection with the largest pump out of service;
(B) a treatment plant capacity of 0.6 gpm per connection under normal rated design flow;
(C) transfer pumps (where applicable) with a capacity of 0.6 gpm per connection with the largest
pump out of service;
(D) a covered clearwell storage capacity at the treatment plant of 50 gallons per connection or, for
systems serving more than 250 connections, 5.0% of daily plant capacity;
(E) a total storage capacity of 200 gallons per connection; CBP02852
(F) a service pump capacity that provides each pump station or pressure plane with two or more
pumps that have a total capacity of 2.0 gpm per connection or that have a total capacity of at least 1,000
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gpm and the ability to meet peak hourly demands with the largest pump out of service, whichever is
less. For systems which provide an elevated storage capacity of 200 gallons per connection, two service
pumps with a minimum combined capacity of 0.6 gpm per connection are required at each pump
station or pressure plane;
(G) an elevated storage capacity of 100 gallons per connection or a pressure tank capacity of 20
gallons per connection. If pressure: tanks are used, a maximum capacity of 30,000 gallons is sufficient
for systems of up to 2,500 connections. An elevated storage capacity of 100 gallons per connection is
required for systems with more than 2,500 connections. Alternate methods of pressure maintenance
may be proposed and will be approved if the criteria contained in subsection (g)(5) of this section are
met; and
(H) emergency power for systems which serve more than 250 connections and do not meet the
elevated storage requirement. Sufficient emergency power must be provided to deliver a minimum of
0.35 gpm per connection to the distribution system in the event of the loss of normal power supply.
Alternately, an emergency interconnection can be provided with another public water system that has
emergency power and is able to supply at least 0.35 gpm for each connection in the combined system.
Emergency power facilities in systems serving 1,000 connections or greater must be serviced and
maintained in accordance with level 2 maintenance requirements contained in the current NFPA 110
standards. Although not required, compliance with NFPA 110 standards is highly recommended for
systems serving less than 1,000 connections. Logs of all emergency power use and maintenance must
be maintained and kept on file for a period of not less than three years. These records must be made
available, upon request, for executive director review.
(c) Noncommunity water systems serving transient accommodation units. The following water capacity
requirements apply to noncommunity water systems serving accommodation units such as hotel rooms,
motel rooms, travel trailer spaces, campsites, and similar accommodations.
(1) Groundwater supplies must meet the following requirements.
(A) If fewer than 100 accommodation units without ground storage, the system must meet the
following requirements:
(i) a well.capacity of 1.0 gpm per unit; and
(ii) a pressure tank capacity of ten gallons per unit with a minimum of 220 gallons.
(B) For systems serving fewer than 100 accommodation units with ground storage or serving 100 or
more accommodation units, the system must meet the following requirements:
(i) a well capacity of 0.6 gpm per unit;
(ii) a ground storage capacity of 35 gpm;
(iii) two or more service pumps which have a total capacity of 1.0 gpm per unit; and
(iv) a pressure tank capacity of ten gallons per unit.
(2) Surface water supplies, regardless of size, must meet the following requirements:
CBP02853
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(A) a raw water pump capacity of 0.6 gpm per unit with the largest pump out of service;
(B) a treatment plant capacity of 0.6 gpm per unit;
(C) a transfer pump capacity (where applicable) of 0.6 gpm per unit with the largest pump out of
service;
(D) a ground storage capacity of 35 gallons per unit with a minimum of 1,000 gallons as clearwell
capacity;
(E) two or more service pumps with a total capacity of 1.0 gpm per unit; and
(F) a pressure tank capacity of ten gallons per unit with a minimum requirement of 220 gallons.
(d) Noncommunity water systems serving other than transient accommodation units.
(1) The following table is applicable to paragraphs (2) and (3) of this subsection and shall be used to
determine the maximum daily dernand for the various types of facilities listed.
Attached Graphic
(2) Groundwater supplies must rneet the following requirements.
(A) Subject to the requirements of subparagraph (B) of this paragraph, if fewer than 300 persons per
day are served, the system must meet the following requirements:
(i) a well capacity which meets or exceeds the maximum daily demand of the system during the
hours of operation; and
(ii) a minimum pressure tank capacity of 220 gallons with additional capacity, if necessary, based
on a sanitary survey conducted by the executive director.
(B) Systems which serve 300 or more persons per day or serve fewer than 300 persons per day and
provide ground storage must meet the following requirements:
(i) a well capacity which meets or exceeds the maximum daily demand;
(ii) a ground storage capacity which is equal to 50% of the maximum daily demand;
(iii) if the maximum daily demand is less than 15 gpm, at least one service pump with a capacity of
three times the maximum daily demand;
(iv) if the maximum daily demand is 15 gpm or more, at least two service pumps with a total
capacity of three times the maximum daily demand; and
Cont'd...
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C BP02855
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