Public-data reporting on Southern California water.
Chromium-6 levels, hardness, contaminants, and what utility testing actually found in your county.
- ·Water quality data · September 2026
Hard Water in Southern California: A County-by-County Hardness Guide (2024)
USGS hardness maps and 2023 Consumer Confidence Reports from seven county utilities show that Southern California delivers hard to very hard water across the region: Los Angeles County 227 to 297 mg/L as CaCO3, Riverside County groundwater zones 300 to 550 mg/L, and Imperial County Colorado River supply 280 to 330 mg/L. This guide explains why SoCal water is so hard, what that costs homeowners in appliance efficiency and infrastructure, and which NSF-certified treatment technologies the evidence supports: salt-based ion exchange softeners (NSF/ANSI 44), template-assisted crystallization conditioners (NSF P449), and reverse osmosis for point-of-use softening (NSF/ANSI 58).
Read article - ·Water quality data · September 2026
Total Dissolved Solids (TDS) in Southern California Water: What the Numbers Mean for Your Home
MWD Colorado River supply averages roughly 700 mg/L TDS; State Water Project supply averages around 230 mg/L. Inland Empire groundwater wells frequently exceed 600 mg/L; Imperial Valley can reach 700 to 900 mg/L from undiluted Colorado River sources. This guide covers California's 500 mg/L enforceable MCL, the WHO taste thresholds, a county-by-county range table compiled from 2023 Consumer Confidence Reports, and a treatment technology comparison showing which systems (reverse osmosis, distillation) actually reduce TDS vs. which do not (activated carbon, water softeners).
Read article - ·Water quality data · September 2026
Lead Contamination in Southern California Tap Water: What Homeowners Need to Know
EPA Action Level data, California DDW lead testing reports, LAUSD school water testing under AB 746, and SWRCB Lead and Copper Rule compliance records show where lead risk is highest in SoCal. The primary risk is from aging in-home plumbing in pre-1986 housing, not from utility source water. Covers how to test, which NSF-certified filters remove lead, and the 2024 EPA Lead and Copper Rule Improvements.
Read article - ·Buyer guide · September 2026
Whole-Home vs. Point-of-Use Water Filter Los Angeles: Buyer Guide (2026)
LA municipal water carries chloramine, chromium-6, and 280 to 320 mg/L hardness. This guide compares whole-home vs. under-sink vs. countertop filtration, maps NSF/ANSI 42, 53, and 58 certifications to specific contaminants, explains the California C-55 contractor license requirement, and shows how to match the right technology to your specific LA neighborhood.
Read article - ·Water quality data · August 2026
Chromium-6 in Southern California Tap Water: What the Data Shows and How to Remove It
Public monitoring records from EPA UCMR3, the California State Water Resources Control Board, and the EWG Tap Water Database document hexavalent chromium detections above the 0.02 ppb state public health goal across SoCal utilities. This guide compares the treatment technologies with certified removal performance, including reverse osmosis (NSF/ANSI 58), strong-base anion exchange, and activated alumina, against the technologies that provide no chromium-6 benefit.
Read article - ·Water quality data · August 2026
Trihalomethanes (TTHMs) in Southern California Water: What Chlorination Byproducts Mean for Your Family
The EPA Maximum Contaminant Level for total trihalomethanes is 80 ppb under the Stage 2 Disinfectants and Disinfection Byproducts Rule. SoCal utilities comply with that federal limit, but California OEHHA public health goals for individual TTHM compounds are far lower. Consumer Confidence Reports from Los Angeles, Orange County, San Diego, and Inland Empire utilities show consistent TTHM detections. This guide maps the county-by-county picture and explains which NSF-certified treatment options reduce or eliminate TTHM exposure.
Read article - ·Water quality data · August 2026
PFAS in Southern California Water: What the 2024 EPA Data Shows by County
The EPA finalized PFAS drinking water limits in April 2024, setting the MCL for PFOA and PFOS at 4 parts per trillion. Public data from UCMR5, a 2023 USGS peer-reviewed study, and utility monitoring reports show Orange County wells, Southeast Los Angeles tap samples, and Inland Empire groundwater have exceeded these levels. This article maps the county-by-county picture and explains which treatment technologies the evidence supports.
Read article - ·Water quality data · August 2026
Perchlorate in Southern California Water: What Inland Empire Homeowners Need to Know
California's MCL for perchlorate is 6 ppb and the OEHHA public health goal is 1 ppb. Public data from the State Water Resources Control Board and EPA monitoring records show perchlorate detections concentrated in the Inland Empire due to aerospace-era industrial contamination. This article maps the county-by-county picture and explains which treatment technologies the evidence supports.
Read article - ·Water quality data · August 2026
Nitrates in Southern California Drinking Water: What the Data Shows by Region
Public records from the California Division of Drinking Water SDWIS database, EPA Safe Drinking Water Information System, and utility Consumer Confidence Reports document nitrate contamination concentrated in the Imperial Valley and parts of eastern Riverside County. This guide maps the regional picture county by county, explains why nitrate is a primary health contaminant rather than an aesthetic concern, and compares the treatment technologies with certified nitrate removal: reverse osmosis (NSF/ANSI 58) and nitrate-selective ion exchange.
Read article - ·Water quality data · August 2026
Chromium-6 in Southern California Water: What 2024 State Testing Found Across 7 Counties
Public data from the California State Water Resources Control Board and the EPA Safe Drinking Water Information System show hexavalent chromium detections above the state public health goal in utilities across all seven Southern California counties. This article maps the 2024 testing picture county by county.
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