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Levels of Treated Water Total Trihalomethanes for ILLINOIS
JULY - SEPTEMBER 1997
| REMINDER: Data Purpose: The ICR data were collected as part of a national research project to support development of national drinking water standards.
They should NOT be used to determine local water systems compliance with drinking water standards, nor should they be used to make personal judgements about individual health risks.
Units: Sample measurements are taken in micrograms per Liter (ug/L) and are regulated in milligrams per Liter (mg/L). A microgram per Liter is equivalent to one contaminant part per billion (ppb). A ppb can be thought of as one grain of salt in a swimming pool. Data for Total Trihalomethanes, haloacetic acids 5, and bromate are presented in ppb. 1 mg/L = 1000 ug/L, or 0.080 mg/L = 80 ug/L = 80 ppb, which happens to be the TTHM standard in the Stage 1 DBP Rule. Calculation in Regulations is Different: Comparisons with compliance calculations based on the existing Total Trihalomethanes standard in CFR Part 141.30 may not be warranted since the standard i s based on an annual average of public water system quarterly averages and not on treatment plant results as shown here. Also the results here are based on different types of samples. Results of Zero: A result of zero may indicate that a sample was analyzed, but that the result was less than the lowest value that the analytical method can reliably report. |
Central Lake County Water Agency
Chicago Water Department
Water Type - SURFACE WATER
(Treated Water)
| Plant Name | Plant ID | Water Type | Quarter | Total Trihalomethanes Concentration (ppb) |
|---|---|---|---|---|
| Jardine Water Purification Plant | 354 | Surface Water | JUL 1997 - SEP 1997 | 19 |
| South Water Purification Plant | 355 | Surface Water | JUL 1997 - SEP 1997 | 22.2 |
City of Aurora
City of Evanston Water Utility
Water Type - SURFACE WATER
(Treated Water)
| Plant Name | Plant ID | Water Type | Quarter | Total Trihalomethanes Concentration (ppb) |
|---|---|---|---|---|
| Evanston Water Utility | 347 | Surface Water | JUL 1997 - SEP 1997 | 19.7 |
City of Rockford P.W. Water Division
Water Type - GROUND WATER
(Treated Water)
| Plant Name | Plant ID | Water Type | Quarter | Total Trihalomethanes Concentration (ppb) |
|---|---|---|---|---|
| Deep Aquifer (30 wells) | 366 | Ground Water | JUL 1997 - SEP 1997 | 5.7 |
IL-American Water Co. - East St. Louis
Water Type - SURFACE WATER
(Treated Water)
| Plant Name | Plant ID | Water Type | Quarter | Total Trihalomethanes Concentration (ppb) |
|---|---|---|---|---|
| East St. Louis Water Treatment Plant | 363 | Surface Water | JUL 1997 - SEP 1997 | 65.4 |
IL-American Water Co. - Peoria
Water Type - GROUND WATER
(Treated Water)
| Plant Name | Plant ID | Water Type | Quarter | Total Trihalomethanes Concentration (ppb) |
|---|---|---|---|---|
| Dodge St. Well Station | 362 | Ground Water | JUL 1997 - SEP 1997 | 9.1 |
| San Koty Treatment Plant | 361 | Ground Water | JUL 1997 - SEP 1997 | 54.1 |
Water Type - SURFACE WATER
(Treated Water)
| Plant Name | Plant ID | Water Type | Quarter | Total Trihalomethanes Concentration (ppb) |
|---|---|---|---|---|
| Illinois River Water Treatment Plant | 360 | Surface Water | JUL 1997 - SEP 1997 | 121.5 |
Northern Illinois Water Corp.- Champaign
Water Type - GROUND WATER
(Treated Water)
| Plant Name | Plant ID | Water Type | Quarter | Total Trihalomethanes Concentration (ppb) |
|---|---|---|---|---|
| East Plant | 346 | Ground Water | JUL 1997 - SEP 1997 | 1.9 |
| West Plant | 345 | Ground Water | JUL 1997 - SEP 1997 | 1.4 |
Rend Lake Intercity Water System
Water Type - SURFACE WATER
(Treated Water)
| Plant Name | Plant ID | Water Type | Quarter | Total Trihalomethanes Concentration (ppb) |
|---|---|---|---|---|
| Rend Lake Intercity Water System | 358 | Surface Water | JUL 1997 - SEP 1997 | 91.6 |
Springfield Water, Light & Power
Water Type - SURFACE WATER
(Treated Water)
| Plant Name | Plant ID | Water Type | Quarter | Total Trihalomethanes Concentration (ppb) |
|---|---|---|---|---|
| Water Purification Plant | 365 | Surface Water | JUL 1997 - SEP 1997 | 75 |
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