No health-based violations on EPA record since 2016.
Serves about 5,928 people (1,794 connections) with surface water from its own intake, and buys water from Highlands Mutual Water Company.
From EPA's record for CA1710006. PurityMap is independent of Konocti County Water District.
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No health-based violations in the last 10 years, from EPA's SDWIS compliance database.
EPA required this system to test for 30 unregulated and emerging contaminants, from January 2023 to October 2023.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 24 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Above the referenced health-based guidance value | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| Perfluorobutanoic acid (PFBA) | 8.2 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| Perfluoropentanoic acid (PFPeA) | 3.9 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-01-11 to 2023-10-04 | UCMR5 Analytical Results: KONOCTI COUNTY WATER DISTRICT (CA1710006) |
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Get PurityMap updates about this water system.
Follow this water →Konocti County Water District's phone number on EPA record is 707-994-2561. Its mailing address is 15844 35th avenue, CLEARLAKE, CA 95422.
According to EPA's record, Konocti County Water District uses surface water from its own intake, and buys water from Highlands Mutual Water Company.
No health-based violations on EPA record since 2016. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in Konocti County Water District's latest lead and copper round, which ended in December 2025. The federal action level is 15 µg/L.
PurityMap has no verified website for Konocti County Water District. Its phone number on EPA record is 707-994-2561. Its mailing address on EPA record is 15844 35th avenue, CLEARLAKE, CA 95422. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.