No health-based violations on EPA record since 2016.
Serves about 20,188 people (6,656 connections) with groundwater from its own wells, and buys water from Riverside Public Utilities, San Bernardino Municipal Water Department, San Bernardino Valley WD and 2 more.
From EPA's record for CA3610057. PurityMap is independent of Riverside Highland Water Company.
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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 July 2024 to January 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorooctanesulfonic acid (PFOS) | 19 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| Perfluorooctanoic acid (PFOA) | 18 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| Perfluorohexanesulfonic acid (PFHxS) | 14 ng/L | 10 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| Lithium | 11 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 | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| Perfluorobutanesulfonic acid (PFBS) | 13 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 | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| Perfluorohexanoic acid (PFHxA) | 14 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| Perfluorobutanoic acid (PFBA) | 10 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| Perfluoroheptanoic acid (PFHpA) | 8.2 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| Perfluoropentanesulfonic acid (PFPeS) | 4 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| Perfluoropentanoic acid (PFPeA) | 17 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| 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 | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| 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 | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| 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 | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| 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 | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| 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 | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-07-22 to 2025-01-09 | UCMR5 Analytical Results: RIVERSIDE HIGHLAND WATER COMPANY (CA3610057) |
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 →Riverside Highland Water Company's phone number on EPA record is 909-825-4128. Its mailing address is 12374 MICHIGAN STREET, GRAND TERRACE, CA 92323.
According to EPA's record, Riverside Highland Water Company uses groundwater from its own wells, and buys water from Riverside Public Utilities, San Bernardino Municipal Water Department, San Bernardino Valley WD and 2 more.
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.
The 90th-percentile lead result in Riverside Highland Water Company's latest lead and copper round, which ended in December 2025, was 1.5 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Riverside Highland Water Company. Its phone number on EPA record is 909-825-4128. Its mailing address on EPA record is 12374 MICHIGAN STREET, GRAND TERRACE, CA 92323. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.