Placerville Water Hardness & Quality Report (2026)

Placerville, California, in El Dorado County — the El Dorado County seat adjacent to Cameron Park and Shingle Springs in the Sierra Nevada Gold Country foothills — receives its water from the El Dorado Irrigation District, drawing from the South Fork American River and Jenkinson Lake through the central California foothills distribution.

The moderately hard 135.5 mg/L hardness and TDS of 376.5 mg/L reflect the El Dorado County supply's moderate Sierra foothill character — the Precambrian Sierra Nevada Granite is largely insoluble, but the Jurassic Amador Group contributes slightly calcareous marble and slate mineral content; Placerville's higher TDS relative to hardness reflects the blending of reservoir water with local well sources in the foothill zone (compare Cameron Park CA: 131/365 in El Dorado County comparable; Shingle Springs CA: 139/388 in El Dorado County comparable; Placerville consistent moderate from the same El Dorado County South Fork American River Sierra Nevada supply). The South Fork American watershed — Precambrian Sierra Nevada Granite (insoluble — primary dilutant), Jurassic Amador Group (slightly calcareous — primary hardness contributor), and Quaternary South Fork American River alluvium (calcareous — TDS contributor).

At 135.5 mg/L with TDS 377, Placerville's water is moderately hard — mild scale buildup. Semi-annual descaling is appropriate. The PFAS level of 5.9 ppt warrants a certified drinking water filter. Review El Dorado Irrigation District's annual water quality report.