No health-based violations on EPA record since 2016.
Serves about 1,433 people (564 connections) with groundwater from its own wells.
From EPA's record for NC0149182. PurityMap is independent of Diamond Head S/D.
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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 June 2023 to December 2023.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorooctanoic acid (PFOA) | 4.6 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| Perfluorohexanesulfonic acid (PFHxS) | 5.5 ng/L | 10 ng/L federal MCL (2024) | Within a historical reference; current applicability unverified | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| Perfluorobutanesulfonic acid (PFBS) | 5.8 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Within the referenced health-based guidance value | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| Perfluorohexanoic acid (PFHxA) | 3.8 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| Perfluoropentanoic acid (PFPeA) | 3.6 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| 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 | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| 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 | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| 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 | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| 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 | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| 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 | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-06 to 2023-12-13 | UCMR5 Analytical Results: DIAMOND HEAD S/D (NC0149182) |
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 →Diamond Head S/D's phone number on EPA record is 919-653-6999. Its mailing address is 202 MACKENAN COURT, CARY, NC 27511.
According to EPA's record, Diamond Head S/D uses groundwater from its own wells.
No health-based violations on EPA record since 2016. EPA also lists 1 missed or late test or report in 10 years. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in Diamond Head S/D'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 Diamond Head S/D. Its phone number on EPA record is 919-653-6999. Its mailing address on EPA record is 202 MACKENAN COURT, CARY, NC 27511. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.