BAR-LEN MWC water quality, CA

At a glance

2 issues above the federal safety limit

Active violation

Lead and Copper Rule Revisions

EPA records an open, unresolved violation against this system for Lead and Copper Rule Revisions.

EPA status: Unaddressed · See details below
Above the federal safety limit

lithium

0.079 mg/L

The most recent test for lithium was higher than the federal safety limit for drinking water.

Most recent EPA PFAS test · See details below
No lead reported

Lead service lines

No lead reported in inventory

This utility's inventory reports no confirmed lead service lines and a low share of unclassified lines.

From the utility's published inventory · See details below
This utility fluoridates

Fluoride

Added

CDC's My Water's Fluoride listing reports this system adjusts fluoride to the recommended level, or buys water from a system that does.

Per CDC My Water's Fluoride · See details below

Past 5 years: 18 health-based violations on file, all marked Resolved or Archived. See compliance history below.

Risk classification follows EPA's published values for safe drinking water, with caution and concern bands reviewed by a clinician. Past resolved violations do not influence this card. See methodology.

Lead service line inventory

Utility reports no confirmed lead service lines

BAR-LEN MWC reports 0 confirmed lead service lines, 44 non-lead, 0 unknown (total 44) in the EPA SDWIS service line inventory (2026Q1).

0 confirmed lead service lines
0 galvanized requiring replacement (LCRI treats these as lead)
0 unknown (0.0% of total)
44 confirmed non-lead (100.0%)
44 total service lines in the system

What to do if your service line might be lead

Ask your utility to check the service-line classification for your specific address. Many utilities provide a public address-lookup tool linked from the inventory page.
Get on the replacement queue. Under the LCRI, utilities must replace all lead and galvanized-requiring- replacement lines within 10 years (clock generally starts November 2027). Some prioritize requests.
Until the line is replaced: flush the tap 30 seconds after long stagnation, use cold water for drinking and cooking, and consider an NSF/ANSI 53 lead-rated tap filter.
Talk to your clinician about a blood lead test for anyone in the home, especially a pregnant person or a child under 6. Lead in drinking water guide.

Inventory data sourced from BAR-LEN MWC ( retrieved May 24, 2026 ; curator confidence: high ). Confirmed against the original source automatically each month; see methodology.

Lead and copper test results

The most recent measurement per contaminant from EPA's Lead and Copper Rule sampling.

Why only lead and copper, and not arsenic, nitrate, or others?

EPA's bulk SDWIS download is the only nationwide per-system sample data they publish, and it only includes the Lead and Copper Rule table. Values for other regulated contaminants (TTHMs, nitrate, arsenic, etc.) appear on this page only when they trigger a violation. For the full per-system contaminant suite, see the utility's annual Consumer Confidence Report (link further down the page).

Most recent measurements per contaminant (Lead and Copper Rule) . Sorted by risk: concern first, then caution, then unrated, then safe.
Contaminant	Most recent	Date	Risk
Lead PB90	0 mg/L	December 31, 2024	Below regulatory thresholds Lead has no safe level (MCLG=0). LCR action level is 0.015 mg/L for the 90th-percentile sample; the LCRI (Oct 2024) lowers the action level to 0.010 mg/L effective Nov 2027. Caution at any detection above LOD; concern anchored to the future LCRI value (0.010 mg/L) for forward consistency. Learn more about Lead. Source.

Data from EPA SDWIS (Lead and Copper Rule sample table) , last refreshed May 24, 2026.

PFAS and emerging contaminants

This system was tested 60 times under EPA's latest PFAS monitoring program; 1 of the 30 chemicals tested was detected.

What is this testing program?

EPA's fifth Unregulated Contaminant Monitoring Rule cycle (UCMR 5, 2023 to 2025) required every public water system serving over 3,300 people to test for 29 per- and polyfluoroalkyl substances (PFAS) plus lithium; 30 chemicals in total. Most recent detection per chemical shown below.

Most recent UCMR 5 detection per contaminant . Sorted by risk: concern first, then caution, then unrated, then safe.
Contaminant	Most recent detection	Date	Risk
lithium	0.079 mg/L	August 2, 2023	Concern HAL only; not enforceable. UCMR-monitored. Learn more about lithium. Source.

Tested but not detected (29 contaminants)

EPA tested for these substances and every sample was below the minimum reporting level. Absence of detection does not mean true zero; it means below the laboratory's quantitation threshold.

Data from EPA UCMR 5 (Unregulated Contaminant Monitoring Rule) , last refreshed May 24, 2026.

Fluoride

Per CDC My Water's Fluoride

BAR-LEN MWC adds fluoride to its drinking water.

CDC classifies a system as fluoridated when it adjusts fluoride to the recommended level, or when it buys water from a system that does. The U.S. Public Health Service recommends 0.7 mg/L for community water fluoridation.

Source: CDC My Water's Fluoride, listed under Bar-Len Mwc (San Bernardino County). Verify on CDC's site .

Area context

San Bernardino County, CA (2020 data)

Community water systems: 23 of 115 add fluoride
Population on fluoridated water: 70,227 of 1,975,680 (3.6%)

California statewide (2020 data)

Population on fluoridated water: 21,879,582 of 38,051,212 (57.5%)
Community water systems adding fluoride: 417 of 3,057

Data from CDC My Water's Fluoride (per-system status) , last refreshed May 19, 2026.

Data from CDC Water Fluoridation Reporting System (state and county aggregates) , last refreshed May 16, 2026.

Recorded contaminant measurements (from violations)

When this system exceeded a regulatory limit and EPA recorded the measured value, that value is shown here. These are not routine sample results: they are the values the violation was triggered on.

Measured values from recorded violations . Most recent first.
Period	Contaminant	Measured	Federal MCL	Status
October 1, 2025	Arsenic	0.0139MG/L	0.01 MG/L	Health-based
July 1, 2025	Arsenic	0.0141MG/L	0.01 MG/L	Health-based
April 1, 2025	Arsenic	0.0148MG/L	0.01 MG/L	Health-based
January 1, 2025	Arsenic	0.015MG/L	0.01 MG/L	Health-based
October 1, 2024	Arsenic	0.0177MG/L	0.01 MG/L	Health-based
July 1, 2024	Arsenic	0.0182MG/L	0.01 MG/L	Health-based
April 1, 2024	Arsenic	0.0167MG/L	0.01 MG/L	Health-based
January 1, 2024	Arsenic	0.0165MG/L	0.01 MG/L	Health-based
October 1, 2023	Arsenic	0.0181MG/L	0.01 MG/L	Health-based
July 1, 2023	Arsenic	0.0175MG/L	0.01 MG/L	Health-based
April 1, 2023	Arsenic	0.0179MG/L	0.01 MG/L	Health-based
January 1, 2023	Arsenic	0.018MG/L	0.01 MG/L	Health-based
October 1, 2022	Arsenic	0.018MG/L	0.01 MG/L	Health-based
July 1, 2022	Arsenic	0.0185MG/L	0.01 MG/L	Health-based
April 1, 2022	Arsenic	0.0185MG/L	0.01 MG/L	Health-based
January 1, 2022	Arsenic	0.0193MG/L	0.01 MG/L	Health-based
October 1, 2021	Arsenic	0.0195MG/L	0.01 MG/L	Health-based
July 1, 2021	Arsenic	0.02MG/L	0.01 MG/L	Health-based

Data from EPA SDWIS (violation records) , last refreshed May 24, 2026.

Compliance history

EPA-recorded violations against this system over the last 5 years.

How to read this section

Health-based violations are when a measured limit was exceeded; the measured concentration is shown alongside the EPA federal limit where SDWIS published it. Monitoring and reporting items are paperwork issues (missed sample dates, late filings) that do not themselves indicate unsafe water.

1 active health-based violation

EPA records 1 health-based violation that has not yet been resolved. An additional 18 health-based violations in the last 5 years are already resolved.

Health-based violations in the last 5 years
Period start	Contaminant	What happened	Measured level	Status
October 1, 2025	Arsenic	Maximum Contaminant Level Violation, Average	0.014 MG/L MCL 0.010 MG/L	Resolved
July 1, 2025	Arsenic	Maximum Contaminant Level Violation, Average	0.014 MG/L MCL 0.010 MG/L	Resolved
April 1, 2025	Arsenic	Maximum Contaminant Level Violation, Average	0.015 MG/L MCL 0.010 MG/L	Resolved
January 1, 2025	Arsenic	Maximum Contaminant Level Violation, Average	0.015 MG/L MCL 0.010 MG/L	Resolved
October 17, 2024	Lead and Copper Rule Revisions	LSL Inventory	Not reported	Unaddressed
October 1, 2024	Arsenic	Maximum Contaminant Level Violation, Average	0.018 MG/L MCL 0.010 MG/L	Resolved
July 1, 2024	Arsenic	Maximum Contaminant Level Violation, Average	0.018 MG/L MCL 0.010 MG/L	Resolved
April 1, 2024	Arsenic	Maximum Contaminant Level Violation, Average	0.017 MG/L MCL 0.010 MG/L	Resolved
January 1, 2024	Arsenic	Maximum Contaminant Level Violation, Average	0.017 MG/L MCL 0.010 MG/L	Resolved
October 1, 2023	Arsenic	Maximum Contaminant Level Violation, Average	0.018 MG/L MCL 0.010 MG/L	Resolved
July 1, 2023	Arsenic	Maximum Contaminant Level Violation, Average	0.018 MG/L MCL 0.010 MG/L	Resolved
April 1, 2023	Arsenic	Maximum Contaminant Level Violation, Average	0.018 MG/L MCL 0.010 MG/L	Resolved
January 1, 2023	Arsenic	Maximum Contaminant Level Violation, Average	0.018 MG/L MCL 0.010 MG/L	Resolved
October 1, 2022	Arsenic	Maximum Contaminant Level Violation, Average	0.018 MG/L MCL 0.010 MG/L	Resolved
July 1, 2022	Arsenic	Maximum Contaminant Level Violation, Average	0.018 MG/L MCL 0.010 MG/L	Resolved
April 1, 2022	Arsenic	Maximum Contaminant Level Violation, Average	0.018 MG/L MCL 0.010 MG/L	Resolved
January 1, 2022	Arsenic	Maximum Contaminant Level Violation, Average	0.019 MG/L MCL 0.010 MG/L	Resolved
October 1, 2021	Arsenic	Maximum Contaminant Level Violation, Average	0.019 MG/L MCL 0.010 MG/L	Resolved
July 1, 2021	Arsenic	Maximum Contaminant Level Violation, Average	0.020 MG/L MCL 0.010 MG/L	Resolved

6 monitoring and reporting item s (paperwork) , 4 still open · these are not health risks

Monitoring and reporting items in the last 5 years
Period start	Relates to	Item	Status
December 31, 2025	Public Notice	Public Notification Violation for NPDWR Violation	Unaddressed
October 17, 2024	Lead and Copper Rule Revisions	LSL Reporting	Unaddressed
October 1, 2023	Lead and Copper Rule	Follow-up Or Routine LCR Tap M/R	Unaddressed
July 1, 2022	Consumer Confidence Rule	Consumer Confidence Report Complete Failure to Report	Resolved
July 1, 2022	Consumer Confidence Rule	Consumer Confidence Report Complete Failure to Report	Resolved
October 1, 2021	Lead and Copper Rule	Follow-up Or Routine LCR Tap M/R	Addressed

20 older violation s (5-10 years ago) · 20 health-based, 0 paperwork , all resolved

Violations 5-10 years ago (20 total)
Period start	Relates to	Item	Measured level	Status
April 1, 2021	Arsenic	Maximum Contaminant Level Violation, Average	0.020 MG/L MCL 0.010 MG/L	Resolved
January 1, 2021	Arsenic	Maximum Contaminant Level Violation, Average	0.021 MG/L MCL 0.010 MG/L	Resolved
October 1, 2020	Arsenic	Maximum Contaminant Level Violation, Average	0.020 MG/L MCL 0.010 MG/L	Resolved
July 1, 2020	Arsenic	Maximum Contaminant Level Violation, Average	9.02 MG/L MCL 0.010 MG/L	Resolved
April 1, 2020	Arsenic	Maximum Contaminant Level Violation, Average	0.020 MG/L MCL 0.010 MG/L	Resolved
January 1, 2020	Arsenic	Maximum Contaminant Level Violation, Average	0.020 MG/L MCL 0.010 MG/L	Resolved
October 1, 2019	Arsenic	Maximum Contaminant Level Violation, Average	0.019 MG/L MCL 0.010 MG/L	Resolved
July 1, 2019	Arsenic	Maximum Contaminant Level Violation, Average	0.020 MG/L MCL 0.010 MG/L	Resolved
April 1, 2019	Arsenic	Maximum Contaminant Level Violation, Average	0.019 MG/L MCL 0.010 MG/L	Resolved
January 1, 2019	Arsenic	Maximum Contaminant Level Violation, Average	0.018 MG/L MCL 0.010 MG/L	Resolved
October 1, 2018	Arsenic	Maximum Contaminant Level Violation, Average	0.018 MG/L MCL 0.010 MG/L	Resolved
July 1, 2018	Arsenic	Maximum Contaminant Level Violation, Average	0.016 MG/L MCL 0.010 MG/L	Resolved
April 1, 2018	Arsenic	Maximum Contaminant Level Violation, Average	0.016 MG/L MCL 0.010 MG/L	Resolved
January 1, 2018	Arsenic	Maximum Contaminant Level Violation, Average	0.015 MG/L MCL 0.010 MG/L	Resolved
October 1, 2017	Arsenic	Maximum Contaminant Level Violation, Average	0.015 MG/L MCL 0.010 MG/L	Resolved
July 1, 2017	Arsenic	Maximum Contaminant Level Violation, Average	0.016 MG/L MCL 0.010 MG/L	Resolved
April 1, 2017	Arsenic	Maximum Contaminant Level Violation, Average	0.015 MG/L MCL 0.010 MG/L	Resolved
January 1, 2017	Arsenic	Maximum Contaminant Level Violation, Average	0.016 MG/L MCL 0.010 MG/L	Resolved
October 1, 2016	Arsenic	Maximum Contaminant Level Violation, Average	0.019 MG/L MCL 0.010 MG/L	Resolved
July 1, 2016	Arsenic	Maximum Contaminant Level Violation, Average	0.018 MG/L MCL 0.010 MG/L	Resolved

Data from EPA SDWIS (violation records) , last refreshed May 24, 2026.

Where to see every contaminant this utility tested for

EPA's bulk SDWIS dataset gives MyTapWater.us per-system measured values for lead and copper, plus violation records for everything else. To see every regulated contaminant this utility tested for in the past year (TTHMs, HAA5, nitrate, arsenic, fluoride, chromium, etc.) with measured values, read the utility's Consumer Confidence Report (CCR).

Every community water system is required by EPA to publish a CCR annually, by July 1, listing every contaminant they sampled, the measured value, the federal limit, and any health-based exceedances. Most utilities post the report online; some mail it with your bill.

How to find BAR-LEN MWC's CCR:

Search the web for "BAR-LEN MWC consumer confidence report" . The PDF is usually on the utility's own website.
Or call the utility directly. Their phone number is in the contact section below.

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Contact this utility

Public administrative contact information for this water system, as filed with the EPA. Use this to ask about your service line, request your home's lead status, or report a water quality issue.

Administrator: MUNOZ, JOHN
Phone: 760-887-2085
Email: MunozJohn@msn.com
Mailing address: P.O Box 77
BARSTOW, CA 92312

Where this page's data comes from

Bundle released 2026-Q2, regenerated May 24, 2026. Each section above also shows its own source date so you can tell at a glance how fresh that part of the page is.

EPA SDWIS bulk download — last refreshed May 24, 2026 (system info, violations, lead and copper samples).
EPA UCMR 5 (Unregulated Contaminant Monitoring Rule) — last refreshed May 24, 2026 (PFAS and lithium).
Lead service line inventory — last refreshed May 24, 2026 (from the utility's reported inventory).
CDC My Water's Fluoride — last refreshed May 19, 2026 (per-system Yes/No fluoridation status).
CDC Water Fluoridation Reporting System — last refreshed May 16, 2026 (state and county fluoridation aggregates).

Every value on this page is cross-verified before publication; read our methodology for the verification steps and corrections process.