| Percentage of houses | Total houses surveyed | Change since 2006 |
|---|
| Type of waste water system |
|---|
| No waste water system | 2% | 7710 | -1% |
| Deep sewer system | 56% | 7710 | 2% |
| Houses using septic systems of any type |
|---|
| Septic tank and common effluent system 28% (28%) |
|---|
| Septic tank and soakage trenches 14% + (13%) | 41% | 7710 | -1% |
| Aerobic waste water package treatment system | 1% | 7710 | 0 |
| All drainage around the house OK (this question records if drainage failures are obvious in the yard area around the house) | 77% | 7712 | 4% |
| Dry system toilets |
|---|
| Dry toilet | 5% | 1961 | N/A |
| In-ground pit toilet | 2% | 1961 | N/A |
| Contained composting toilet | 3% | 1961 | N/A |
| Details of the waste systems |
|---|
| Grease trap | 8% | 5345 | 0 |
| Septic tank not able to be located | 4% | 2179 | -1% |
| Pump out truck had access to septic tank | 94% | 2179 | 3% |
| Septic tank lid protected from damage | 71% | 2173 | 11% |
| Septic tank lid not protected from damage | 24% | 2058 | -9% |
| No soakage trench (CED (common effluent disposal) system) | 63% | 2427 | 5% |
| Functional soakage trench | 28% | 2427 | -3% |
| Non-functional soakage trench | 10% | 2312 | -2% |
