| provide broad protection | 0.47 |
| leach lead | 0.29 |
| flow through pipe | 0.28 |
| taste bad | 0.24 |
| test positive | 0.22 |
| control corrosion | 0.19 |
| meet safety standards | 0.16 |
| treated | 0.37 |
| contaminated with lead | 0.34 |
| contaminated | 0.31 |
| expelled | 0.28 |
| filtered | 0.25 |
| discolored | 0.16 |
| distributed in next cou… | 0.16 |
| tested | 0.16 |