Guilford Water AUTH serves 28,135 people from groundwater. 31 results are on record. No measured result is above a legal limit.
No measured result is above a legal limit.
4,592service lines inventoried
From the utility's inventory reported to EPA (2026Q2). Look up your address with the utility.
2health-based violations in the last 10 years
From EPA SDWIS. Counted once per contaminant per year, as in the Track record score.
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.
The records describe the system. A certified lab test shows what reaches your glass.
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
Silver Lake Research
Lead, bacteria, nitrate, copper, iron, chlorine, hardness and pH
What it can't tell you: Each test gives a yes/no or a rough range, not a lab number, and it cannot detect PFAS or arsenic.
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
★ Best choice: Brita Elite Water Filter Pitcher, certified for lead.
| Pick | Product | Certification | Price | Link |
|---|---|---|---|---|
| ★ Best choice | Brita Elite Water Filter Pitcher | Certified for Lead (NSF/ANSI 53, WQA) | $ | Check price on Amazon |
| Also good | Aquasana Claryum 3-Stage Max Flow Under-Sink Filter (AQ-6300M) | Certified for Lead (NSF/ANSI 53, WQA) | $$ | Check price at Aquasana |
| Also good | Aquasana Clean Water Machine Countertop Filter (AQ-CWM2) | Certified for Lead (NSF/ANSI 53, WQA) | $$ | Check price at Aquasana |
| Pick | Product | Certification | Price | Link |
|---|---|---|---|---|
| Also good | SmartFlow® Reverse Osmosis | Certified for lead (WQA) | $$$ | Check price at Aquasana |
| Also good | Waterdrop G3P600 Tankless Reverse-Osmosis System | Certified for Lead (NSF/ANSI 58-2024, IAPMO) | $$$ | Check price at Waterdrop |
| Also good | Waterdrop G3P800 Tankless Reverse-Osmosis System | Certified for Lead (NSF/ANSI 58-2024, IAPMO) | $$$ | Check price at Waterdrop |
| Also good | AquaTru Carafe Countertop Reverse-Osmosis Purifier (AT100) | Certified for Lead (NSF/ANSI 58, IAPMO) | $$$ | Check price on Amazon |
| Also good | AquaTru Classic Countertop Reverse-Osmosis Purifier (AT2000) | Certified for Lead (NSF/ANSI 58, IAPMO) | $$$ | Check price on Amazon |
| Also good | Aquasana Claryum 2-Stage Under-Sink Filter (AQ-5200) | Certified for Lead (NSF/ANSI 53, WQA) | $$ | Check price on Amazon |
| Also good | Culligan ZeroWater 10-Cup Pitcher (ZEROP10) | Certified for Lead (NSF/ANSI 53, IAPMO) | $ | Check price on Amazon |
| Also good | Frizzlife SP99 Under-Sink Filter | Certified for Lead (NSF/ANSI 53-2024, IAPMO) | $$ | Check price on Amazon |
| Also good | PUR Plus Faucet Filter (FM2500V) | Certified for Lead (NSF/ANSI 53, IAPMO) | $ | Check price on Amazon |
| Also good | Patriot Pure Ultimate Water Filtration System | Certified for Lead (NSF/ANSI 53, NSF, IAPMO) | $$ | Check price on Amazon |
| Also good | iSpring RCC7AK Alkaline Reverse Osmosis SystemUse code REFISPRING at checkout: 10% off your first iSpring order. | Brand lab-tested, not independently certified for lead | $$ | Check price at iSpring |
| Also good | iSpring RO5004F Tankless Reverse Osmosis System with UVUse code REFISPRING at checkout: 10% off your first iSpring order. | Brand lab-tested, not independently certified for lead | $$$ | Check price at iSpring |
| Also good | Waterdrop X12 Reverse Osmosis System | Brand lab-tested, not independently certified for lead | $$$$ | Check price at Waterdrop |
★ Best available: iSpring WGB32B-PFKS PFAS & Heavy Metals Whole House Filter, the best fit here; nothing in this group is certified yet.
| Pick | Product | Certification | Price | Link |
|---|---|---|---|---|
| ★ Best available | iSpring WGB32B-PFKS PFAS & Heavy Metals Whole House FilterUse code REFISPRING at checkout: 10% off your first iSpring order. | Brand lab-tested, not independently certified for lead | $$$ | Check price at iSpring |
PurityMap earns a commission from these links. "Best choice" and "Budget pick" go to certified products first; commission never decides them. As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure.
Lead service lines
GUILFORD WATER AUTH reported 2 lead and 43 galvanized service lines to replace in EPA’s inventory (2026Q2). Many utilities replace these lines for free or share the cost. Ask GUILFORD WATER AUTH whether your home’s line is on its list before you pay anyone.
Local help
Call to be connected with a local plumbing provider about lead service lines, repiping or fixture replacement.
GUILFORD WATER AUTH (PWS ID PA7280038) is a public water system serving 28,135 people in Guilford, Pennsylvania.
GUILFORD WATER AUTH is on record as drawing from groundwater. The source shapes which contaminants matter most for this system.
PurityMap's record for GUILFORD WATER AUTH holds 31 findings: 31 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 GUILFORD WATER AUTH'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 GUILFORD WATER AUTH 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 GUILFORD WATER AUTH'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.
Follow Guilford Water AUTH
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 | 2023-04-20 to 2023-10-12 | Not detected | — |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | 2023-04-20 to 2023-10-12 | Not detected | — |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | 2023-04-20 to 2023-10-12 | Not detected | — |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | 2023-04-20 to 2023-10-12 | Not detected | — |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | 2023-04-20 to 2023-10-12 | Not detected | — |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | 2023-04-20 to 2023-10-12 | Not detected | — |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | 2023-04-20 to 2023-10-12 | Not detected | — |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | 2023-04-20 to 2023-10-12 | Not detected | — |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | 2023-04-20 to 2023-10-12 | Not detected | — |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | 2023-04-20 to 2023-10-12 | Not detected | — |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | 2023-04-20 to 2023-10-12 | Not detected | — |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit) | 2023-04-20 to 2023-10-12 | Not detected | — |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | 2023-04-20 to 2023-10-12 | Not detected | — |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | 2023-04-20 to 2023-10-12 | Not detected | — |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | 2023-04-20 to 2023-10-12 | Not detected | — |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | 2023-04-20 to 2023-10-12 | Not detected | — |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | 2023-04-20 to 2023-10-12 | Not detected | — |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | 2023-04-20 to 2023-10-12 | Not detected | — |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | 2023-04-20 to 2023-10-12 | Not detected | View evidence |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | 2023-04-20 to 2023-10-12 | Not detected | — |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | 2023-04-20 to 2023-10-12 | Not detected | — |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | 2023-04-20 to 2023-10-12 | Not detected | — |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | 2023-04-20 to 2023-10-12 | Not detected | View evidence |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | 2023-04-20 to 2023-10-12 | Not detected | View evidence |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | 2023-04-20 to 2023-10-12 | Not detected | — |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | 2023-04-20 to 2023-10-12 | Not detected | — |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | 2023-04-20 to 2023-10-12 | Not detected | — |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | 2023-04-20 to 2023-10-12 | Not detected | — |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | 2023-04-20 to 2023-10-12 | Not detected | — |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit) | 2023-10-12 | Not detected | — |
| Lead (90th percentile) | Non-Detect (ND) | 15 µg/L federal action level | 2025–2025 monitoring period | Not detected | View evidence |
UCMR5 Analytical Results
UCMR5 Analytical Results: GUILFORD WATER AUTH (PA7280038)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: GUILFORD WATER AUTH (PA7280038)
US EPA SDWIS