Households with Piped Water (number)
| 2009 |
| Nairobi | 514,943 |
| Meru | 170,912 |
| Kiambu | 158,445 |
| Nakuru | 118,036 |
| Mombasa | 110,955 |
| Kilifi | 93,557 |
| Nyeri | 88,332 |
| Kirinyaga | 51,515 |
| Uasin Gishu | 50,168 |
| Kisumu | 49,658 |
| Kajiado | 48,283 |
| Muranga | 46,955 |
| Taita Taveta | 37,451 |
| Embu | 37,288 |
| Makueni | 36,034 |
| Kwale | 31,361 |
| Nyandarua | 29,594 |
| Machakos | 27,785 |
| Garissa | 24,492 |
| Bungoma | 23,765 |
| Kericho | 23,743 |
| Laikipia | 21,809 |
| Nandi | 17,747 |
| Trans Nzoia | 16,880 |
| Bomet | 16,819 |
| Kakamega | 14,459 |
| Kitui | 13,758 |
| Baringo | 13,623 |
| Elgeyo Marakwet | 13,426 |
| Isiolo | 13,413 |
| Turkana | 12,945 |
| Siaya | 11,698 |
| Narok | 10,241 |
| Homa Bay | 9,969 |
| Kisii | 8,007 |
| Busia | 7,689 |
| West Pokot | 7,353 |
| Samburu | 6,389 |
| Mandera | 5,769 |
| Lamu | 5,030 |
| Tana River | 5,024 |
| Vihiga | 4,155 |
| Marsabit | 3,747 |
| Nyamira | 3,666 |
| Migori | 2,901 |
| Tharaka Nithi | 2,895 |
| Wajir | 1,061 |