Bacteriological Study oe Denver Water Supply ii 
COMPARATIVE RESULTS OF CO-OPERATIVE INVESTIGATION 
Samples Collected November 11, 1916. 
Table No. I.—Number of Bacteria per c. c. on Gelatin at 20° C. 
after 4 8 hours. 
Sample 
No. 
._ 
Source 
Jno. B. 
Ekeley 
State 
Chemist 
U. of C. 
W. G. 
Sackett 
Bact. 
Colo. Ag. 
Exp. Sta. 
Dr. W. C. 
Mitchell 
Bact. City 
& Co. of 
Denver 
H. I. de 
Berard 
Chemist 
D. U. W. 
Company 
Average 
1 . Mississippi Av. 
Infiltration Gal¬ 
leries Inlet W. 
D. Res. 
6 
14 
16 
7 
11 
2. Platt Riv. Raw 
—Intake Mars- 
ton Lake—4 8 " 
Cond. 
165 
2080 
1400 
1325 
1240 
3. Bear Cr. Raw— 
Intake Marston 
Lake—Flume . . . 
1400 
5400 
Liq 
4850 
3880 
4. Marston Lake— 
Outlet N. S. 
Plant—Raw .... 
435 
750 
300 
600 
520 
5. Marston Lake N. 
S. Plant-Treated 
6 
19 
16 
16 
14 
6 . P. C. Infiltration 
Galleries—30" 
Cond. 
58 
96 
8 
74 
59 
7. Slow Sand 
Filters, Treated 
—40" Cond. 
Wynetka . 
54 
12 
53 
75 
49 
8 . Willard Rapid 
Filters, Treated 
—34" Cond. 
Wynetka . 
m 
6 
43 
9 
62 
30 
9. Marston Lake 
So. Side Plant 
—Treated—4 8 " 
Cond. Wynetka 
• 
8 
20 
12 
23 
16 
10. Drinking Foun¬ 
tain in City.— 
Cor/ 1st & Bdwy. 
18 
41 
20 
57 
34 
11. Cherry Cr. In¬ 
filtration Galler¬ 
ies—Cap. Hill 
Res. 
(Bottle 
| Broken) 
1 
5 
1 
2 
12. Tap in City 
Chemical 
Laboratory .j 51 
25 
21 
| 69 
42 
