National Assessment of First Nations Water and Wastewater Systems - British Columbia Regional Roll-Up Report
Figure 3.5 – Risk Profile Based on Water Treatment System Classification
This graph illustrates the risk profile of water treatment systems in British Columbia by the treatment system classification. It illustrates what percentage of each type of system is high, medium and low risk. It also shows the mean overall risk level by treatment classification.
There are six treatment system classifications:
- None
- Small System
- Level I
- Level II
- Level III
- Level IV
- MTA (Municipal Type Agreement)
None
- The mean overall risk level for treatment systems classified as “None” is 7.78.
- 5 percent of the systems classified as “None” are low risk; 4 percent of the systems classified as “None” are medium risk; and 91 percent of the systems classified as “None” are high risk.
Small Systems
- The mean overall risk level for Small Systems is 6.94.
- 12 percent of Small Systems are low risk; 17 percent of Small Systems are medium risk; and 71 percent of Small Systems are high risk.
Level I Systems
- The mean overall risk for Level I Systems is 5.56.
- 38 percent of Level I systems are low risk; 12 percent of Level I Systems are medium risk; and 50 percent of Level I Systems are high risk.
Level II Systems
- The mean overall risk for Level II Systems is 4.07.
- 65 percent of Level II Systems are low risk; 20 percent of Level II Systems are medium risk; and 15 percent of Level II Systems are high risk.
Level III Systems
- The mean overall risk for Level III Systems is 5.76.
- 11 percent of Level III Systems are low risk; 56 percent of Level III Systems are medium risk; and 33 percent of Level III Systems are high risk.
Level IV Systems
- The mean overall risk for Level IV Systems is 2.20.
- 100 percent of Level IV Systems are low risk.
MTA (Municipal Type Agreement) Systems
- The mean overall risk for MTA (Municipal Type Agreement) Systems is 3.82.
- 67 percent of MTA (Municipal Type Agreement) Systems are low risk; 26 percent of MTA Systems are medium risk; and 7 percent of MTA Systems are high risk.
Return to source image