Short answer: In the 2022–2024 records we hold for Walnut Creek Sud, no listed result is above a legal limit, but 5 health-based violations are on record (EPA SDWIS). 2 substances were detected and 29 were tested and not detected. The water is from Walnut Creek SUD, serving 40,410 residents.
Your water bill or annual water quality report names your actual supplier.
Surface water
The treatment details are not on record.
Mains, then your building’s service line.
Plumbing inside the building is outside this record.
No measured result is above a legal limit; a past health-based violation (Chlorite) is on record.
1.1 MG/L, sampled 2019. EPA SDWIS violations.
1.0 mg/L.
Exceeded the federal Chlorite limit (1.0 mg/L); measured 1.1 MG/L, 2019 (Resolved).
Forms in the pipes as the disinfectant reacts with natural organic matter.
Test your own tap first: a certified lab result shows what reaches your glass.
1.2 µg/L, sampled 2022–2024 monitoring period. EPA SDWIS (Lead & Copper Rule).
15 µg/L federal action level. EPA health goal (MCLG): 0.
The 90th-percentile tap result was 1.2 µg/L (below the 15 µg/L action level).
Usually from lead service lines, solder and fixtures inside buildings, after the water leaves treatment.
Test your own tap first. To reduce it: Lead-certified carbon filter, or reverse osmosis (NSF/ANSI 53 (lead)).
7.3 ng/L, sampled 2023-02-06 to 2023-11-06. EPA UCMR 5.
No federal limit is on record for it.
Detected at up to 7.3 ng/L. No federal or state limit exists for this substance; shown for transparency, not graded.
Comes with the source water; home plumbing does not add it.
Test your own tap first. To reduce it: Reverse osmosis, or carbon certified for PFAS (NSF/ANSI 53 or 58, with PFBA named on the listing).
WALNUT CREEK SUD (EPA PWSID TX1840008) delivers surface water to 40,410 residents. This report reflects 29 individual PFAS result(s) from the source UCMR5 observations and the latest Lead & Copper Rule 90th-percentile result. Water hardness and disinfectant type are pending the utility's own annual report.
5health-based violations in the last 10 years
From EPA SDWIS. Counted once per contaminant per year, as in the Track record score. All 14 EPA filings are listed below.
Every filing is listed; the Track record score counts at most one per contaminant per year.
Resolved
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The record describes water leaving treatment and samples across the system. Pipes, solder and fixtures inside a building can add lead the record can’t see, especially in older buildings with lead service lines.
Test your waterMeasured in this report
Sampled across the system
Not in this record
Only a tap test measures it
Know what comes from your tap, starting with a first-draw lead sample.
Compare each result with its named reference in our test reader.
Choose a technology certified for what your test found.
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.
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.
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.
When your results arrive, read them here → · Compare every kit we list
Texas Commission on Environmental Quality certifies the labs that test drinking water in Texas. Find a certified lab in Texas ↗ · What lab tests cost →
| Finding | Reference type | Technology | Certification to check |
|---|---|---|---|
| Lead (90th percentile)1.2 µg/L | Action level | Lead-certified carbon filter, or reverse osmosis | NSF/ANSI 53 (lead) |
| Perfluorobutanoic acid (PFBA)7.3 ng/L | No federal limit | Reverse osmosis, or carbon certified for PFAS | NSF/ANSI 53 or 58, with PFBA named on the listing |
★ Best choice: Brita Elite Water Filter Pitcher, certified for lead.
| Pick | Product | Details and price | Certification | Why it’s listed | Link |
|---|---|---|---|---|---|
| ★ Best choice | PitcherBrita Elite Water Filter Pitcher | TreatsleadPrice$ | Certified for Lead (NSF/ANSI 53, WQA) | Why it’s listed: its current certification names lead, found in Walnut Creek Sud’s record.See the evidence | Check price on Amazon |
| Also good | Under-sinkAquasana Claryum 3-Stage Max Flow Under-Sink Filter (AQ-6300M) | TreatsleadPrice$$ | Certified for Lead (NSF/ANSI 53, WQA) | Why it’s listed: its current certification names lead, found in Walnut Creek Sud’s record.See the evidence | Check price at Aquasana |
| Also good | CountertopAquasana Clean Water Machine Countertop Filter (AQ-CWM2) | TreatsleadPrice$$ | Certified for Lead (NSF/ANSI 53, WQA) | Why it’s listed: its current certification names lead, found in Walnut Creek Sud’s record.See the evidence | Check price at Aquasana |
| Pick | Product | Details and price | Certification | Why it’s listed | Link |
|---|---|---|---|---|---|
| Also good | Reverse osmosisSmartFlow® Reverse Osmosis | TreatsleadTechnologyReverse osmosisPrice$$$ | Certified for lead (WQA) | Why it’s listed: its current certification names lead, found in Walnut Creek Sud’s record.See the evidence | Check price at Aquasana |
| Also good | Under-sinkWaterdrop G3P600 Tankless Reverse-Osmosis System | TreatsleadPrice$$$ | Certified for Lead (NSF/ANSI 58-2024, IAPMO) | Why it’s listed: its current certification names lead, found in Walnut Creek Sud’s record.See the evidence | Check price at Waterdrop |
| Also good | Under-sinkWaterdrop G3P800 Tankless Reverse-Osmosis System | TreatsleadPrice$$$ | Certified for Lead (NSF/ANSI 58-2024, IAPMO) | Why it’s listed: its current certification names lead, found in Walnut Creek Sud’s record.See the evidence | Check price at Waterdrop |
| Also good | CountertopAquaTru Carafe Countertop Reverse-Osmosis Purifier (AT100) | TreatsleadPrice$$$ | Certified for Lead (NSF/ANSI 58, IAPMO) | Why it’s listed: its current certification names lead, found in Walnut Creek Sud’s record.See the evidence | Check price on Amazon |
| Also good | CountertopAquaTru Classic Countertop Reverse-Osmosis Purifier (AT2000) | TreatsleadPrice$$$ | Certified for Lead (NSF/ANSI 58, IAPMO) | Why it’s listed: its current certification names lead, found in Walnut Creek Sud’s record.See the evidence | Check price on Amazon |
| Also good | Under-sinkAquasana Claryum 2-Stage Under-Sink Filter (AQ-5200) | TreatsleadPrice$$ | Certified for Lead (NSF/ANSI 53, WQA) | Why it’s listed: its current certification names lead, found in Walnut Creek Sud’s record.See the evidence | Check price on Amazon |
| Also good | PitcherCulligan ZeroWater 10-Cup Pitcher (ZEROP10) | TreatsleadPrice$ | Certified for Lead (NSF/ANSI 53, IAPMO) | Why it’s listed: its current certification names lead, found in Walnut Creek Sud’s record.See the evidence | Check price on Amazon |
| Also good | Under-sinkFrizzlife SP99 Under-Sink Filter | TreatsleadPrice$$ | Certified for Lead (NSF/ANSI 53-2024, IAPMO) | Why it’s listed: its current certification names lead, found in Walnut Creek Sud’s record.See the evidence | Check price on Amazon |
| Also good | Faucet-mountPUR Plus Faucet Filter (FM2500V) | TreatsleadPrice$ | Certified for Lead (NSF/ANSI 53, IAPMO) | Why it’s listed: its current certification names lead, found in Walnut Creek Sud’s record.See the evidence | Check price on Amazon |
| Also good | CountertopPatriot Pure Ultimate Water Filtration System | TreatsleadPrice$$ | Certified for Lead (NSF/ANSI 53, NSF, IAPMO) | Why it’s listed: its current certification names lead, found in Walnut Creek Sud’s record.See the evidence | Check price on Amazon |
| Also good | Reverse osmosisiSpring RCC7AK Alkaline Reverse Osmosis SystemUse code REFISPRING at checkout: 10% off your first iSpring order. | TechnologyReverse osmosisPrice$$ | Brand lab-tested, not independently certified for lead | See the evidence | Check price at iSpring |
| Also good | Reverse osmosisiSpring RO5004F Tankless Reverse Osmosis System with UVUse code REFISPRING at checkout: 10% off your first iSpring order. | TechnologyReverse osmosisPrice$$$ | Brand lab-tested, not independently certified for lead | See the evidence | Check price at iSpring |
| Also good | Reverse osmosisWaterdrop X12 Reverse Osmosis System | TechnologyReverse osmosisPrice$$$$ | Brand lab-tested, not independently certified for lead | See the evidence | Check price at Waterdrop |
★ Best available: iSpring WGB32B-PFKS PFAS & Heavy Metals Whole House Filter, the best fit here; nothing in this group is certified yet.
| Pick | Product | Details and price | Certification | Why it’s listed | Link |
|---|---|---|---|---|---|
| ★ Best available | Whole-houseiSpring WGB32B-PFKS PFAS & Heavy Metals Whole House FilterUse code REFISPRING at checkout: 10% off your first iSpring order. | Price$$$ | Brand lab-tested, not independently certified for lead | See the evidence | Check price at iSpring |
Also: PFAS picks →
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.
Ask your utility first
Water utilities keep an inventory of service-line materials. Ask Walnut Creek SUD whether your address is on it before you replace pipes.
Local help
Call to be connected with a local plumbing provider about lead service lines, repiping or fixture replacement.
Older buildings may have lead service lines, solder or fixtures. Walnut Creek Sud’s record shows lead at 1.2 µg/L (15 µg/L federal action level). Test first-draw water, then filter if needed.
1 of 29 PFAS tested was detected in Walnut Creek Sud’s record (PFBA 7.3 ng/L). If PFAS matters to you, a filter certification names each compound it covers.
Most utilities keep chlorine or chloramine in the pipes. A carbon filter certified for taste and odor reduces either; your utility can tell you which it uses.
Your utility’s annual water quality report usually lists hardness; a test strip also measures it.
Reverse osmosis reduces many dissolved contaminants, including lead and minerals, at a single faucet, with some water sent to drain.
Get one email when Walnut Creek Sud’s record changes.
One email when a new sampling round is published, a result moves above or below its reference, or the system's score changes.PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For Walnut Creek Sud, PFBA 7.3 ng/L was detected, with no federal or state limit; the lead 90th-percentile result was 1.2 µg/L against the 15 µg/L action level; one health-based violation is on record (Chlorite). WALNUT CREEK SUD (PWSID TX1840008) has a Purity Score of 91/100 (confidence: moderate), assessed at the water-system level and computed only from contaminants that were measured. Water can change in your own pipes, so a certified test is the only way to know what comes out of your tap. What we found →
WALNUT CREEK SUD (PWS ID TX1840008) is the public water system on record for Walnut Creek Sud, Texas, serving about 40,410 people. Confirm the utility on your water bill before acting on a specific finding. Water utility →
Surface water (primary source of record in EPA SDWIS). Water utility →
Yes. In EPA's UCMR 5 testing (2023-02-06 to 2023-11-06), PFBA was detected at 7.3 ng/L. It has no federal or state limit, so PurityMap shows it without grading it. No PFAS with a limit was detected. What we found →
WALNUT CREEK SUD's most recent lead 90th-percentile result (2022–2024) was 1.2 µg/L, below the 15 µg/L action level. That figure comes from sampled homes; lead usually enters from a building's own pipes and fixtures, so only a test at your tap tells you what you drink. Your household →
The federal SDWIS record lists a health-based violation for WALNUT CREEK SUD within about the last ten years: Chlorite (2019). The findings above show each one's status. At a glance →
PurityMap's current record for Walnut Creek Sud holds 32 findings: 1 above a reference, 1 detected within the reference, 1 detected with no limit and 29 not detected. Each finding links to its dated public record; a parameter that was never monitored is shown as pending, not as a pass. Records →
UCMR5 Analytical Results
UCMR5 Analytical Results: WALNUT CREEK SUD (TX1840008)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: WALNUT CREEK SUD (TX1840008)
US EPA SDWIS
State SDWIS Compliance Record
EPA SDWIS Violations & Enforcement: WALNUT CREEK SUD (TX1840008)
US EPA SDWIS
Methodology: how we analyze water. Prepared with AI assistance and reviewed by the PurityMap Editorial Team before publication.
EPA SDWIS, EPA UCMR 5 and utility reports, each dated and linked.
Units converted to one basis; a non-detect kept distinct from zero.
Each result tagged by reference type: MCL, action level, screening level or aesthetic.
Every value sits against its own reference, never a blended one.
Measured subjects summarised at the water-system level; an open health-based violation caps the score.
Treatment is matched to what was found; a product is called certified only when its current certification names it.
What the Purity Score means: a summary of this water system’s published record, capped while a health-based violation is open. It is not a test of any tap. WALNUT CREEK SUD · PWSID TX1840008 · Purity Score 91/100 (Excellent) · Confidence: moderate · Assessed at the water-system level
Full methodology →Start with the hot-or-cold tap check. Where Walnut Creek SUD reported something related, it's shown below.
Lead at Walnut Creek SUD: 1.2 µg/L (90th percentile, 2022–2024 monitoring period). Lead has no taste, so a taste neither shows nor rules it out.