Harris County Fwsd 51 serves 19,671 people from surface water. 31 results are on record. No measured result is above a legal limit; lithium sits above a screening level.
No measured result is above a legal limit; lithium sits above a screening level.
3,600service lines inventoried
From the utility's inventory reported to EPA (2026Q2). Look up your address with the utility.
0health-based violations in the last 10 years
From EPA SDWIS. A clean violation history means no enforcement action was recorded; it does not cover contaminants without a limit.
No result is not a pass. Your utility's annual water quality report may list them, and a certified lab test covers your own tap.
A federal limit (an MCL or action level) is an enforceable legal cap; a health goal is often stricter. Meeting the limit is a compliance fact, not a health clearance, and PurityMap publishes no overall compliance verdict.
Plumbing inside a home can add lead that the system record can't show. A tap test tells you what reaches your glass.
lead 1.6 µg/L, below the 15 µg/L action level
PFBS 3.5 ng/L, below the 2000 ng/L EPA health advisory (+3 more PFAS detected)
Understand water treatment technologies →
Understand:PFAS in Harris County FwsdLead in Harris County Fwsd
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure.
Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
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
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.
When your results arrive, read them here → · Compare every kit we list
Each card names which of this system’s findings its current certification covers, and which it doesn’t.
As an Amazon Associate, PurityMap earns from qualifying purchases. A product appears here only when a current certification record covers at least one identified concern; every concern stays listed. The retail offer is looked up afterwards and never changes which products appear or their order. Affiliate disclosure.
Local help
Call to be connected with a local plumbing provider about lead service lines, repiping or fixture replacement.
HARRIS COUNTY FWSD 51 (PWS ID TX1010238) is a public water system serving 19,671 people in Harris County Fwsd, Texas.
HARRIS COUNTY FWSD 51 is on record as drawing from surface water. The source shapes which contaminants matter most for this system.
PurityMap's record for HARRIS COUNTY FWSD 51 holds 31 findings: 1 above a reference, 3 detected within the reference, 2 detected with no limit and 25 not detected, from 31 evidence records. Every finding links to its source; a substance that was never monitored is shown as pending, not as a pass.
PurityMap does not issue a safety verdict. It publishes HARRIS COUNTY FWSD 51's measured results against each contaminant's benchmark so you can read them in context. Safety depends on the specific finding, your plumbing, and how the water reaches your tap.
The latest published record for HARRIS COUNTY FWSD 51 is dated 2026-10-15. Utilities report on regulatory cycles, so results reflect the monitoring period rather than a live reading.
No. It is assessed at the water-system level from HARRIS COUNTY FWSD 51's own monitoring. It does not cover the service line to your building or the plumbing inside it, which can add lead and other metals after the water leaves the system. A tap test is the way to know what reaches your glass.
Lithium, Lead (90th percentile), Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA), Perfluorobutanoic acid (PFBA) and Perfluoropentanoic acid (PFPeA) were detected in this record. Each finding shows its measured value, its reference and its source on this page.
Start with what the record shows: the PFAS findings above list each measured value against its reference. This record cannot show your home's plumbing, so a tap test tells you what reaches your glass. If you decide to treat your water, look for a filter whose certification covers the specific PFAS compounds in your record; the section "Certified for a concern found here" lists only products with a current certification record for these concerns.
Start with what the record shows: the lead findings above list each measured value against its reference. This record cannot show your home's plumbing, so a tap test tells you what reaches your glass. If you decide to treat your water, look for a filter whose certification covers the specific contaminant in your record; the section "Certified for a concern found here" lists only products with a current certification record for these concerns.
Follow Harris County Fwsd 51
One email when a new sampling round is published, a result moves above or below its reference, or the system's score changes.
Follow this water →As listed for this system in EPA's records. Your water bill names your supplier.
| Substance | Result | Reference | Sampled | Status | Evidence |
|---|---|---|---|---|---|
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | 2024-06-21 to 2025-07-31 | Not detected | — |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-06-21 to 2025-07-31 | Not detected | — |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | 2024-06-21 to 2025-07-31 | Not detected | — |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | 2024-06-21 to 2025-07-31 | Not detected | — |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | 2024-06-21 to 2025-07-31 | Not detected | — |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-06-21 to 2025-07-31 | Not detected | — |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | 2024-06-21 to 2025-07-31 | Not detected | — |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | 2024-03-11 to 2025-07-31 | Not detected | — |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | 2024-06-21 to 2025-07-31 | Not detected | — |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | 2024-03-11 to 2025-07-31 | Not detected | — |
| Perfluorobutanoic acid (PFBA) | 7.2 ng/L | No federal or state limit; shown for transparency | 2024-06-21 to 2025-07-31 | Detected, no limit | View evidence |
| Perfluorobutanesulfonic acid (PFBS) | 3.5 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit) | 2024-06-21 to 2025-07-31 | Below limit | View evidence |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-06-21 to 2025-07-31 | Not detected | — |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-06-21 to 2025-07-31 | Not detected | — |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-06-21 to 2025-07-31 | Not detected | — |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-06-21 to 2025-07-31 | Not detected | — |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-06-21 to 2025-07-31 | Not detected | — |
| Perfluorohexanoic acid (PFHxA) | 4.8 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | 2024-06-21 to 2025-07-31 | Below limit | View evidence |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | 2024-06-21 to 2025-07-31 | Not detected | View evidence |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-06-21 to 2025-07-31 | Not detected | — |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | 2024-06-21 to 2025-07-31 | Not detected | — |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | 2024-06-21 to 2025-07-31 | Not detected | — |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | 2024-06-21 to 2025-07-31 | Not detected | View evidence |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | 2024-06-21 to 2025-07-31 | Not detected | View evidence |
| Perfluoropentanoic acid (PFPeA) | 5.5 ng/L | No federal or state limit; shown for transparency | 2024-06-21 to 2025-07-31 | Detected, no limit | View evidence |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | 2024-06-21 to 2025-07-31 | Not detected | — |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | 2024-03-11 to 2025-07-31 | Not detected | — |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | 2024-03-11 to 2025-07-31 | Not detected | — |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | 2024-06-21 to 2025-07-31 | Not detected | — |
| Lithium | 11.7 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit) | 2024-03-11 to 2025-07-31 | Above guideline | View evidence |
| Lead (90th percentile) | 1.6 µg/L | 15 µg/L federal action level | 2021–2023 monitoring period | Below limit | View evidence |
UCMR5 Analytical Results
UCMR5 Analytical Results: HARRIS COUNTY FWSD 51 (TX1010238)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: HARRIS COUNTY FWSD 51 (TX1010238)
US EPA SDWIS