Is the tap water safe? Hardness, PFAS and lead by district

By the official record, yes. Every water district from Solana Beach to Vista met every state and federal drinking water standard in its latest yearly water quality report, and the EPA's record shows no health-based violation for any of them in the last five years. The water is hard: most of it runs 13 to 16 grains per gallon (Olivenhain calls its 15 grains "quite hard"), and the desalinated water in Carlsbad, Oceanside, Vallecitos and Vista's mix is the soft exception, about 3.5 to 4. PFAS: Carlsbad found none of the 29 it tests for and Olivenhain no regulated PFAS; Santa Fe (Solana Beach), San Dieguito (Encinitas) and Oceanside's groundwater found traces below California's notification levels.

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Lead is measured at the tap in homes; the action level is 15 parts per billion at the 90th percentile. A grain per gallon is 17.1 mg/L, as Oceanside's report states it. San Dieguito's 2025 report wasn't readable here, so its row is the 2024 report.

Hard. Olivenhain's own words: "the water delivered by OMWD is considered to be quite hard. Our hardness values run up to about 250 PPM (parts per million) which is equivalent to approximately 15 GPG (grains per gallon). If you are setting up a dishwasher, water softener, or other appliance requiring you to indicate the hardness/softness of your water, these are the values you should use."

It also says hard water "is safe to drink", and that removing the minerals "does not provide any health benefits." On salt softeners: they "discharge a brine waste to the sewer," "many local sewer agencies prohibit the discharge of these brine wastes," and it points to off-site exchange-canister services as "generally in compliance with local sewer regulations." Ask your sewer agency before installing one. (Olivenhain Municipal Water District)

Inland and the City of San Diego, same story: Escondido 215 mg/L (210 to 230); Rincon del Diablo 230 mg/L, "13.5 grains" (Improvement District 1) and 215 mg/L, "12.6 grains" (Improvement District A); the City of San Diego's three treatment plants 237 to 243 mg/L (13.8 to 14.2 grains), and the water it buys already treated 145 mg/L (8.5 grains). The City's 2025 report lists hardness among the readings that "do not have MCLs or PHGs and are not considered to present a risk to human health." (Escondido 2025 · Rincon ID1 · Rincon IDA · City of San Diego 2025)

The San Diego County Water Authority: "Metropolitan has infrequently found PFAS at very low levels just over the detection limits in some of its supply sources. The Water Authority's seawater desalination supplies are treated with reverse osmosis which is known to remove PFAS." California's notification levels, as the Water Authority's wholesaler lists them: PFOA 5.1, PFOS 6.5, PFHxS 3, PFBS 500 parts per trillion. Each district's own result is below.

Sources: Water Authority water quality page; Metropolitan's 2024 water quality report to member agencies.

Santa Fe Irrigation District (Solana Beach, Rancho Santa Fe)

• Record: "zero water quality violations".
• Hardness: 235 mg/L average (200 to 280), about 13.7 grains per gallon.
• PFAS: PFOA 0.70 parts per trillion on average (none detected to 2.1); PFOS not detected. The report: "all detections were well below the new health standard as well as below the California Notification and Action levels."
• Lead: about 1.7 parts per billion at the 90th percentile; 30 homes sampled, none above the 15 ppb action level.
• Where it comes from: About 75% imported, 19% local (Lake Hodges) and 6% recycled, treated at the R.E. Badger plant.
• Water quality questions: 858-756-2424 · the 2025 report

San Dieguito Water District (City of Encinitas) (Cardiff, Leucadia, Old Encinitas, part of New Encinitas)

• Record: no violations listed; EPA's record shows one lead and copper monitoring (paperwork) violation from 2022, resolved in 2023.
• Hardness: 275 mg/L average (250 to 300), about 16.1 grains per gallon.
• PFAS: PFOA 2.6 parts per trillion on average (2.4 to 2.8), under California's notification level of 5.1. No other PFAS listed.
• Lead: 1.4 parts per billion at the 90th percentile; 42 homes sampled in 2023, none above the action level.
• Where it comes from: San Dieguito Reservoir, Lake Hodges and the Water Authority's aqueduct, treated at the R.E. Badger plant.
• Water quality questions: 760-633-2658 · the 2024 report

Olivenhain Municipal Water District (Olivenhain, parts of Encinitas and Carlsbad)

• Record: "No Level 1 assessments or violations occurred".
• Hardness: up to about 250 mg/L, "approximately 15 GPG (grains per gallon)" in the district's own words.
• PFAS: "Regulated PFAS compounds have not been detected in OMWD's water supply"; federal testing in 2024 found none of 29 PFAS. PFBA, which has no standard, showed up in one of four samples (up to 2.9 parts per trillion).
• Lead: not detected at the 90th percentile; 30 homes sampled in 2025, none above the action level.
• Where it comes from: 100% imported (Northern California and the Colorado River); about 78% treated at Olivenhain's own plant.
• Water quality questions: 760-753-6466 · the 2025 report

City of Del Mar (Del Mar)

• Record: "never violated a maximum contaminant level or any other water quality standard".
• Hardness: 242 mg/L average (200 to 285), 14.1 grains per gallon (11.7 to 16.6).
• PFAS: The report lists no PFAS results. Del Mar's water comes treated from the City of San Diego's Miramar plant.
• Lead: 2.26 parts per billion at the 90th percentile; 20 homes sampled in July 2024, none above the action level.
• Where it comes from: Water Authority water, treated by the City of San Diego at the Miramar Water Treatment Plant.
• Water quality questions: 858-755-3294 · the 2025 report

Carlsbad Municipal Water District (most of Carlsbad)

• Record: "meets all 2025 state and federal drinking water standards".
• Hardness: it depends on the blend: imported water at 230 mg/L (about 13.5 grains), desalinated water at about 61 mg/L (about 3.5 grains).
• PFAS: "non-detect for all 29 PFAS compounds covered by the sampling method in Carlsbad Municipal Water District drinking water."
• Lead: 1.3 parts per billion at the 90th percentile; 34 homes sampled in 2024, none above the action level.
• Where it comes from: 82% imported; 18% from the Carlsbad Desalination Plant.
• Water quality questions: 442-339-2722 · the 2025 report

City of Oceanside Water Utilities (Oceanside)

• Record: "consistently met all state and federal water quality standards".
• Hardness: 13.2 grains per gallon on average from the Weese plant (226 mg/L); 3.5 grains from the desalination plant.
• PFAS: Found only in the Mission Basin groundwater, about a tenth of the supply: PFOS 1.7 parts per trillion on average (none detected to 2.5) and PFHxS 1.5 (none detected to 2.0, under California's notification level of 3). Not detected at the other sources.
• Lead: 1.2 parts per billion at the 90th percentile; 50 homes sampled in 2024, all compliant with the action level.
• Where it comes from: About 72% imported water treated at the Weese plant, about 18% bought treated (sometimes blended with desalinated water) and about 10% Mission Basin groundwater.
• Water quality questions: 760-435-5824 · the 2025 report

Vallecitos Water District (San Marcos, parts of Carlsbad)

• Record: "met or exceeded all state and federal potable drinking water standards"; EPA's record shows one lead and copper reporting (paperwork) violation opened in July 2025.
• Hardness: by treatment plant, 242 to 255 mg/L (about 14 to 15 grains) for imported water; about 68 mg/L (about 4 grains) for desalinated water.
• PFAS: The report lists no PFAS results.
• Lead: 1.7 parts per billion at the 90th percentile; 50 homes sampled in 2024.
• Where it comes from: 100% imported from the San Diego County Water Authority, including desalinated water since late 2015.
• Water quality questions: 760-744-0460 · the 2024 report

Vista Irrigation District (Vista)

• Record: "VID has not had any violations of these regulations".
• Hardness: 54 to 310 mg/L in 2025, which the report says "translate to 3.2 - 18.1 grains per gallon".
• PFAS: PFOA and PFOS: "no PFAS were detected." PFBA, which has no standard, showed up at one plant (up to 6.0 parts per trillion).
• Lead: 4.2 parts per billion at the 90th percentile; 51 homes sampled in 2024, none above the action level.
• Where it comes from: Lake Henshaw, the Colorado River, Northern California and the Carlsbad desalination plant.
• Water quality questions: 760-597-3143 · the 2025 report

The State Water Board tracks community water systems for its SAFER program and lists the ones failing drinking water standards. Here is what it says about the districts on this page (State list dated November 4, 2026):

Countywide, 21 of the 88 San Diego County systems on the State's list are failing right now, all small systems (the largest serves 2,574 people, in Pine Valley). None of them is a coastal North County district.

"Not Assessed" means the State didn't score that system in this risk assessment; it is not on the failing list either.

"Not At-Risk" is the State's best rating. The water-quality risk score looks ahead (for example, sources trending toward a limit); it is not a violation. Each district also publishes a yearly water quality report (Consumer Confidence Report). Source: State Water Resources Control Board, SAFER risk assessment (data.ca.gov), read daily.

Ask which test and which standard they mean, then check it against your district's report above: it lists every regulated contaminant, the legal limit and what was found. Call the district's water quality line before you sign anything; a free in-home test is a sales tool, not the official record.

• Your district's report, read with you: PJ sits down with it, sets the dishwasher or softener to your district's hardness, and goes over a water treatment quote before you sign, from $59 the first hour.

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