.
PROPOSED RULES
respoudiuz concentration
_ shall not be exceeded:
Temperature
qin F*)
MO ta 7 eee
S28 fossa. we.
ASA LOGS ee
HOO TO Seen
TU.7 CoN. ol.
TUB COON ee.
of
(C’)
TOM
Db
PLT
V7.7
CLA
TOS
11995
CL) When the supplier of water em- {§ 141.21. When the supplier of water ex‘ercises the option provided by this paraplays the membrane filter tecnnique
:
the coliform (graph ¢b) he shall maintain no less Unan
' pursiaunt to § l4121Ca)
densities shall not exceed one per 100 70.3 mg/l free chlorine in the public water
}
miltililers as the arithmetic mean of all distribution system. Measurements saait
i snimples examined per month; and either. be made in accordance with "Standard
(i) Four per 100 milliliters in more; Methods," 13th Ed., pp 129-132.
e
fluoride t
{
Level Crops)
ta OL
to Wil.
lo PG
to 24
TOL
fo UB.
4
aa
v0
La
1.6
La
4
“than one standard sample when less: § 141.21
The requirements of this paragraph (b) doo hot apply to public water supplies
/ than 20 are cxamined per month: or
i
ii} Four per 100 milliliters in more!
than five pereent of the standard sam-i
ples when 20 or more are examined per.
Microhiologien)
contaminant
anrapolieage and analytical recpuiregre nds,
(an) The supplier of water shall musc
; coliform density measurements, for the
month.
(7270) When the supplier of water cem- |
nurpose of determinine complinnes with
samples
Population served:
§ 141.15, In accordance with the analytiploys the fermentation tubo method anc.
cal
recommendations
set forth
in
10
milliliter
standard
portions
pursuant
:
§ LbL.12
Maxiowint contaminant levels:
"Standard Methods for the Examination
to
§
141,21,
coliforms
shall
not
be
pres;
for organic chemicals.
ent In more than 10 percent of the por- t' of Water and Wastewater,” American’
The maximum contaminont level for~ tions in any month; and cither
'' Public Health Association, 13th Edition,
the tolal concentration of organic chem- (A) Threo or more portions in one:: pp 662-688, exccpt that only a 190 miilileals, as determined by the carbon chlo- sample when less than 20 samples are; liter sample size shall be employcd in
: the membrane filter technique. ‘The
roform, extract method set forth in: examined per month; or
§ 141.24(b), ls 0.7 meg/1.
‘ (B) Three or more portions in more! samples shall be taken at points which
are representative of the conditions
§ 141.13 Maximum contaminant levels | than flyg percent of the sampics if 20 ori within the distribution system.
moro samples are examined per month.
‘for pesticides.
(b) The supplier of water shall take
r
(ik) When the supplier of water emThe following are the maximum conploys the fermentation tube method and: coliform density samples at regular intaminant levels for pesticides:
100 milliliter standard portions pursu- : tervals throughout the month, anc in
(a) Chlorinated Hydrocarbons:
‘ ant to §141.21(a) coliforms shall not be : number proportionate to the population
Level mg/t present in more than 60 percent of the}; served by the public water system. In no
portions in any month; and either
event shall the frequency be less than as
Chlordane (cls and trans) (1,2,4,5,;
(A) Five or more portions in more |
6.7.8.8 “~- Octachloro - 30.4,5.70:
set forth below:
than one sample . when less than five!' °
tetrahydro-4,7-methanolidan) . 0.003
Minimum number of
=
oe
serving only educational {nstitutions.
Endrin
(1,2,3.4,10,10 - Hexachlore-.
>
6.7 -~ epoxy - 1,4,40,5,6.7,8.8a-
octahydro-l4-endo,
e¢ndo-5,8-
are
examined:
or
(B) Five or more portions in more
1 than 20 percent of the samples when
Cumethano naphtnalene) —- 2-2" 0.00021 five samples or more are examined.
Heptachlor
—(1,4.5.6.7.8.8-He p ta-
—4.7chloro-an4practetrahydro
nnoindena) ~,--------.----
Heptochlor Epoxide
(1,4,5,6,7,8,8-
‘
tetrahydro-4,7-methanoindan)
(4,1,1-Trichloro-2,2-
Toxaphene
chlorinated
(O,,IL,,C1,—Technicat
campheno,
67-69%
(b) Chlorophenoxys:
24-D
(2,4-Dichloréphenoxyacetic
acid) ___.-~~.~---~------------ 0.1
-
as
determined
; § 141.21(f).
I,
§ 141.16
plate
by
count
the
standard
provided
inj
Substitution of residual chlo-
rine measurement for total coliform
measurement, 4
:
.
(a) The supplier of water may, with
‘the npproval of the State, substitute the
Jitnin the distribution system at the
The maximum contaminant level of
stituted microbiological sample. There
pa a eer ieee a lle lc
7
8
&
8,501 to B.400---------------+-=~---== 10
8.401 to 10,300. __--.--~---~----+-----
11
10,301 to 11,100_-_---.---- +--+ ep eeneee
12
io01 to 13700 Te mee me meme
15
not
a '500 Pata mere re cw w rsa ene
s
ee mma ae
13,701 to 14,600____-~----+----------14,601 to 15,500_._..---------..------
3
16
i7
are
representative
of
the
conditions
frequency of at least four for each sub-
1550) [0 Didn--n-nnnnoreeconenn 3
19'901 to 19.800.__...--------+-a-.--- 22
10,801 to 20,700._...---.--- beweeneewe 23
20,701 to 21,500_.__.___. ee ee nen nnn ene
24
22,301 to 23,200__-._-_-_--.----------
26
21.501 to 22,300.__.- Ween eweceneeee ene 25
23-201 to 24,000 _.__----~.---------- 27
turbidity in the drinking water at a rep- shall be at least daily determinations of
resentative entry point(s) to the distri- chlorine residual. Measurements shall be
F400) 10 Su:008 -----na-recererrnnoe ae
—45'591 to 28.000 _......-............ 30
cept that five or fewer turbiclity units
the supplier of water exercises the Op-
33,001 to 37,000 ___----------------- 40
37.001 to 41,000 Loe eee enneweren 45.
shall maintain no less than 0.2 mg/l! free
46,001 to 50,000 -__.---.-.-.-2------
2eeni to 93.000weve 38
may be allowed if the supplier of water
tton provided in this paragraph (a), he
higher turbidity does not:
(a) Interfere with disinfection;
chlorine in the public water distribution
system.
59.001 to 54,000 ._.._-.-.-..-.----..- 60
one to 59,000 ..-------~--+-~----- 65
tive disinfectant agent throughout the 4900 or fewer persons, the supplier may,
~ 79/001 to 76.000 _....-..--..-.-+.--. 80
can demonstrate to the State that the
(b) Prevent maintenanceof an effec-
distribution system; and
(c) Interfere
with
microbiological
determinations.
§ 141.15 Maximum microbiological con-
latinane levela:
ee eens
:
—1g"t91 to 18.900....._.--...--------. 2
bution
system is one turbidity unit (TU), made in accordance with “Standard
as determined pursuant to § 141.22, ex- Methods,” 13th Ed., pp 129-132. When
apm ee es Fn
7.601 to 8500--.-.----------------.--
5
required to be taken by §141.21(b), pro-
Seehaximum contaminant level
Y
5,801 to 6,700--.._--.-----.----------
3
4
15.901 to 16.300.------------------020 18
not. more than 75 percent of the samples
vided that the supplier of water takes
chiorine residual sampies at points which
.
4/101 to 4.900_-...-----------2s------
2
use of chlorine residual monitoring for
24,5-TP Slilvex
(2,4.5-Trichlorophenoxyproplonic acid) -.------- 0. 01
.
3,301 to 4.100.------------aeser-----6.701 to 7,600.-..--.---.~------------
liliter
.
chlorine) .-.-------------«.--- 0. 005
.
2501 to 3,300.......
:
0.0001! bacterial
bis {p-methnoxyphenyl] cthane). 0.1
samples per monti.
4/901 to 5800........-0.22 7
1 greater than 500 organisms per one mil-\
cyclohexane, gamma isomer)..._ 0.004
Methoxychlor
(b) The supplier of water shall pro-|
25 to 2.500
| vide water in which there shall be no(
0.0001 i
Heptachloro - 2,3-cpoxy-3n,4,7,7a~
Lindane (1,2,3,4,5,6-Hexachloro-
{
¥
&
(b) For public water systems serving
with the approval of the State, make a
total substitution
of chlorine residual
41,001 to 46,000 ___....---...-------
60
55
93'Sor tnegue Te 70
76.001 to 63,000 _......-.-..-------83,001 to 90,000 __.....---------.-
a5
90
measurement for the samples required to
be taken by § 141.21(b): Provided, That
90,001 to 06,000 1.neenee 95
beops to eeewenn enn e cores ewer eens 109
sidual samples at points which are repre-
—y55'591 +6 190000. en 120
the suppiler of water takes chlorine re-
30001 te ap000a tan necenceresnneren MD
. {a} The supplicr of water may emPloy onc of two methods to determine
sentative of the conditions within the
distribution system at the rate of one
igo901 te 220,000wo orcenencowcecercccs Lio
929/001 to 250.000._--....------------- 150
contaminant levels.
required to be ‘taken.per month-under
290,001 to 320,000_____.___--...------- 170
compliance with the coliform maximum
;
of
ae
per day for cach microblological sample
250,001 to 290,000__.....----_--------- 16n
~ FEDERAL REGISTER, VOL. 40, NO. 51—FRIDAY, MARCH 14, 1975
90fuee
18410 —
-