John Hovannisian Water System, CA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2024-2026). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
John Hovannisian Water System at a glance
John Hovannisian Water System serves about 80 people through 18 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Madera County, California. EPA system ID: CA2000647; phone on file: 559-287-5894. They can tell you what your service line is made of and whether they pay to replace it.
John Hovannisian Water System's lead record
Against the period ending 2020 (1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for John Hovannisian Water System is 1 ppb across 2 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2020 | 1 ppb |
Where this result ranks
Of the 2,884 California systems with a lead result, the median latest reading is 0 ppb; 30 are over 15 ppb right now and 215 have gone over at some point. John Hovannisian Water System's reported as 0 (not detected) sits at the 15th percentile in California and the 7th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
67 other systems share Madera County; 36 of them have a higher latest lead result than John Hovannisian Water System. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Madera | 66,560 | 3 ppb |
| Chowchilla City Water Dept | 13,916 | 0 (not detected) |
| Riverstone/Rootcreek Water District | 10,276 | 1.2 ppb |
| Madera Valley Water Company | 6,524 | 0 (not detected) |
| Yosemite Spring Park Util Co | 5,300 | 0 (not detected) |
| Tesoro Viejo Master Mwc, Inc. | 4,660 | 0 (not detected) |
| Cal Am - Oakhurst | 3,710 | 5 ppb |
| Valley State Prison | 3,151 | 0 (not detected) |
| Madera Co Md10a-Madera Ranchos | 3,072 | 5.4 ppb |
| Cal Am - Bass Lake | 3,066 | 2 ppb |
Your move
Look up your address in John Hovannisian Water System's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask John Hovannisian Water System whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. Why sampled homes are the worst-case ones is in the guide to reading the number. A zero today does not rule out a jump later - the rules are tightening in 2027.